Problem: Recently Pashmak has been employed in a transportation company. The company has k buses and has a contract with a school which has n students. The school planned to take the students to d different places for d days (each day in one place). Each day the company provides all the buses for the trip. Pashmak has to arrange the students in the buses. He wants to arrange the students in a way that no two students become close friends. In his ridiculous idea, two students will become close friends if and only if they are in the same buses for all d days.

Please help Pashmak with his weird idea. Assume that each bus has an unlimited capacity.

Input

The first line of input contains three space-separated integers n, k, d (1 ≤ n, d ≤ 1000; 1 ≤ k ≤ 109).

Output

If there is no valid arrangement just print -1. Otherwise print d lines, in each of them print n integers. The j-th integer of the i-th line shows which bus the j-th student has to take on the i-th day. You can assume that the buses are numbered from 1 to k.

Examples

Input

3 2 2


Output

1 1 2 
1 2 1 


Input

3 2 1


Output

-1

Note

Note that two students become close friends only if they share a bus each day. But the bus they share can differ from day to day.

Solution (in JAVA):

Solution:
import java.util.*;
import java.util.regex.*;
import java.text.*;
import java.math.*;
import java.io.*;
import java.lang.reflect.*;

public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		OutputWriter out = new OutputWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();
	}
}

class Task {

	int [][] arr;
	
	public void solve(int testNumber, InputReader in, OutputWriter out) {
		int n=in.readInt(), k=MiscUtils.min(in.readInt(), n), d=in.readInt();
		arr=new int[d][n];
		for (int i=0; i<d; i++) arr[i][0]=1;
		for (int i=1; i<n; i++) {
			int j;
			for (j=0; j<d; j++) arr[j][i]=arr[j][i-1];
			for (j=d-1; j>=0 && arr[j][i]==k; j--);
			if (j>=0) {
				arr[j][i]++;
				for (j++; j<d; j++) arr[j][i]=1;
			} else {
				out.println(-1);
				return;
			}
		}
		for (int i=0; i<d; i++) {
			for (int j=0; j<n; j++) out.print(arr[i][j]+" ");
			out.println();
		}
	}

}

class OutputWriter extends PrintWriter {

	public OutputWriter(OutputStream outputStream) {
		super(new BufferedWriter(new OutputStreamWriter(outputStream)));
	}

}

class InputReader {
	private boolean finished = false;

	private InputStream stream;
	private byte[] buf = new byte[1024];
	private int curChar;
	private int numChars;
	private SpaceCharFilter filter;

	public InputReader(InputStream stream) {
		this.stream = stream;
	}

	public int read() {
		if (numChars == -1)
			throw new InputMismatchException();
		if (curChar >= numChars) {
			curChar = 0;
			try {
				numChars = stream.read(buf);
			} catch (IOException e) {
				throw new InputMismatchException();
			}
			if (numChars <= 0)
				return -1;
		}
		return buf[curChar++];
	}

	public int peek() {
		if (numChars == -1)
			return -1;
		if (curChar >= numChars) {
			curChar = 0;
			try {
				numChars = stream.read(buf);
			} catch (IOException e) {
				return -1;
			}
			if (numChars <= 0)
				return -1;
		}
		return buf[curChar];
	}

	public int readInt() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		int res = 0;
		do {
			if (c < '0' || c > '9')
				throw new InputMismatchException();
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c));
		return res * sgn;
	}

	public long readLong() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		long res = 0;
		do {
			if (c < '0' || c > '9')
				throw new InputMismatchException();
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c));
		return res * sgn;
	}

	public String readString() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		StringBuilder res = new StringBuilder();
		do {
			if (Character.isValidCodePoint(c))
				res.appendCodePoint(c);
			c = read();
		} while (!isSpaceChar(c));
		return res.toString();
	}

	public boolean isSpaceChar(int c) {
		if (filter != null)
			return filter.isSpaceChar(c);
		return isWhitespace(c);
	}

	public static boolean isWhitespace(int c) {
		return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
	}

	private String readLine0() {
		StringBuilder buf = new StringBuilder();
		int c = read();
		while (c != '\n' && c != -1) {
			if (c != '\r')
				buf.appendCodePoint(c);
			c = read();
		}
		return buf.toString();
	}

	public String readLine() {
		String s = readLine0();
		while (s.trim().length() == 0)
			s = readLine0();
		return s;
	}

	public String readLine(boolean ignoreEmptyLines) {
		if (ignoreEmptyLines)
			return readLine();
		else
			return readLine0();
	}

	public BigInteger readBigInteger() {
		try {
			return new BigInteger(readString());
		} catch (NumberFormatException e) {
			throw new InputMismatchException();
		}
	}

	public char readCharacter() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		return (char) c;
	}

	public double readDouble() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		double res = 0;
		while (!isSpaceChar(c) && c != '.') {
			if (c == 'e' || c == 'E')
				return res * Math.pow(10, readInt());
			if (c < '0' || c > '9')
				throw new InputMismatchException();
			res *= 10;
			res += c - '0';
			c = read();
		}
		if (c == '.') {
			c = read();
			double m = 1;
			while (!isSpaceChar(c)) {
				if (c == 'e' || c == 'E')
					return res * Math.pow(10, readInt());
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				m /= 10;
				res += (c - '0') * m;
				c = read();
			}
		}
		return res * sgn;
	}

	public boolean isExhausted() {
		int value;
		while (isSpaceChar(value = peek()) && value != -1)
			read();
		return value == -1;
	}

	public String next() {
		return readString();
	}

	public SpaceCharFilter getFilter() {
		return filter;
	}

	public void setFilter(SpaceCharFilter filter) {
		this.filter = filter;
	}

	public interface SpaceCharFilter {
		public boolean isSpaceChar(int ch);
	}
}

class MiscUtils {
	public static final int[] DX4 = { 1, 0, -1, 0 };
	public static final int[] DY4 = { 0, -1, 0, 1 };
	public static final int[] DX8 = { 1, 1, 1, 0, -1, -1, -1, 0 };
	public static final int[] DY8 = { -1, 0, 1, 1, 1, 0, -1, -1 };
	public static final int[] DX_KNIGHT = { 2, 1, -1, -2, -2, -1, 1, 2 };
	public static final int[] DY_KNIGHT = { 1, 2, 2, 1, -1, -2, -2, -1 };

	private static final String[] ROMAN_TOKENS = { "M", "CM", "D", "CD", "C",
			"XC", "L", "XL", "X", "IX", "V", "IV", "I" };
	private static final int[] ROMAN_VALUES = { 1000, 900, 500, 400, 100, 90,
			50, 40, 10, 9, 5, 4, 1 };

	public static long josephProblem(long n, int k) {
		if (n == 1)
			return 0;
		if (k == 1)
			return n - 1;
		if (k > n)
			return (josephProblem(n - 1, k) + k) % n;
		long count = n / k;
		long result = josephProblem(n - count, k);
		result -= n % k;
		if (result < 0)
			result += n;
		else
			result += result / (k - 1);
		return result;
	}

	public static int parseIP(String ip) {
		String[] components = ip.split("[.]");
		int result = 0;
		for (int i = 0; i < 4; i++)
			result += (1 << (24 - 8 * i)) * Integer.parseInt(components[i]);
		return result;
	}

	public static String buildIP(int mask) {
		StringBuilder result = new StringBuilder();
		for (int i = 0; i < 4; i++) {
			if (i != 0)
				result.append('.');
			result.append(mask >> (24 - 8 * i) & 255);
		}
		return result.toString();
	}

	public static String convertToRoman(int number) {
		StringBuilder result = new StringBuilder();
		for (int i = 0; i < ROMAN_TOKENS.length; i++) {
			while (number >= ROMAN_VALUES[i]) {
				number -= ROMAN_VALUES[i];
				result.append(ROMAN_TOKENS[i]);
			}
		}
		return result.toString();
	}

	public static int convertFromRoman(String number) {
		int result = 0;
		for (int i = 0; i < ROMAN_TOKENS.length; i++) {
			while (number.startsWith(ROMAN_TOKENS[i])) {
				number = number.substring(ROMAN_TOKENS[i].length());
				result += ROMAN_VALUES[i];
			}
		}
		return result;
	}

	public static <T extends Comparable<T>> T min(T first, T second) {
		if (first.compareTo(second) <= 0)
			return first;
		return second;
	}

	public static <T extends Comparable<T>> T max(T first, T second) {
		if (first.compareTo(second) <= 0)
			return second;
		return first;
	}

	public static int[] getIntArray(String s) {
		String[] tokens = s.split(" ");
		int[] result = new int[tokens.length];
		for (int i = 0; i < result.length; i++)
			result[i] = Integer.parseInt(tokens[i]);
		return result;
	}
}

class IntegerUtils {
	public static long gcd(long a, long b) {
		a = Math.abs(a);
		b = Math.abs(b);
		while (b != 0) {
			long temp = a % b;
			a = b;
			b = temp;
		}
		return a;
	}

	public static int gcd(int a, int b) {
		a = Math.abs(a);
		b = Math.abs(b);
		while (b != 0) {
			int temp = a % b;
			a = b;
			b = temp;
		}
		return a;
	}

	public static int[] generatePrimes(int upTo) {
		int[] isPrime = generateBitPrimalityTable(upTo);
		List<Integer> primes = new ArrayList<Integer>();
		for (int i = 0; i < upTo; i++) {
			if ((isPrime[i >> 5] >>> (i & 31) & 1) == 1)
				primes.add(i);
		}
		isPrime = new int[primes.size()];
		for (int i = 0; i < primes.size(); i++)
			isPrime[i] = primes.get(i);
		return isPrime;
	}

	public static boolean[] generatePrimalityTable(int upTo) {
		boolean[] isPrime = new boolean[upTo];
		if (upTo < 2)
			return isPrime;
		Arrays.fill(isPrime, true);
		isPrime[0] = isPrime[1] = false;
		for (int i = 2; i * i < upTo; i++) {
			if (isPrime[i]) {
				for (int j = i * i; j < upTo; j += i)
					isPrime[j] = false;
			}
		}
		return isPrime;
	}

	public static int[] generateBitPrimalityTable(int upTo) {
		int[] isPrime = new int[(upTo + 31) >> 5];
		if (upTo < 2)
			return isPrime;
		Arrays.fill(isPrime, -1);
		isPrime[0] &= -4;
		for (int i = 2; i * i < upTo; i++) {
			if ((isPrime[i >> 5] >>> (i & 31) & 1) == 1) {
				for (int j = i * i; j < upTo; j += i)
					isPrime[j >> 5] &= -1 - (1 << (j & 31));
			}
		}
		return isPrime;
	}

	public static int[] generateDivisorTable(int upTo) {
		int[] divisor = new int[upTo];
		for (int i = 1; i < upTo; i++)
			divisor[i] = i;
		for (int i = 2; i * i < upTo; i++) {
			if (divisor[i] == i) {
				for (int j = i * i; j < upTo; j += i)
					divisor[j] = i;
			}
		}
		return divisor;
	}

	public static long powerInFactorial(long n, long p) {
		long result = 0;
		while (n != 0) {
			result += n /= p;
		}
		return result;
	}

	public static int sumDigits(CharSequence number) {
		int result = 0;
		for (int i = number.length() - 1; i >= 0; i--)
			result += digitValue(number.charAt(i));
		return result;
	}

	public static int digitValue(char digit) {
		if (Character.isDigit(digit))
			return digit - '0';
		if (Character.isUpperCase(digit))
			return digit + 10 - 'A';
		return digit + 10 - 'a';
	}

	public static int longCompare(long a, long b) {
		if (a < b)
			return -1;
		if (a > b)
			return 1;
		return 0;
	}

	public static long[][] generateBinomialCoefficients(int n) {
		long[][] result = new long[n + 1][n + 1];
		for (int i = 0; i <= n; i++) {
			result[i][0] = 1;
			for (int j = 1; j <= i; j++)
				result[i][j] = result[i - 1][j - 1] + result[i - 1][j];
		}
		return result;
	}

	public static long[][] generateBinomialCoefficients(int n, long module) {
		long[][] result = new long[n + 1][n + 1];
		if (module == 1)
			return result;
		for (int i = 0; i <= n; i++) {
			result[i][0] = 1;
			for (int j = 1; j <= i; j++) {
				result[i][j] = result[i - 1][j - 1] + result[i - 1][j];
				if (result[i][j] >= module)
					result[i][j] -= module;
			}
		}
		return result;
	}

	public static long[] generateBinomialRow(int n, long module) {
		long[] result = generateReverse(n + 1, module);
		result[0] = 1;
		for (int i = 1; i <= n; i++)
			result[i] = result[i - 1] * (n - i + 1) % module * result[i]
					% module;
		return result;
	}

	public static int[] representationInBase(long number, int base) {
		long basePower = base;
		int exponent = 1;
		while (number >= basePower) {
			basePower *= base;
			exponent++;
		}
		int[] representation = new int[exponent];
		for (int i = 0; i < exponent; i++) {
			basePower /= base;
			representation[i] = (int) (number / basePower);
			number %= basePower;
		}
		return representation;
	}

	public static int trueDivide(int a, int b) {
		return (a - trueMod(a, b)) / b;
	}

	public static long trueDivide(long a, long b) {
		return (a - trueMod(a, b)) / b;
	}

	public static int trueMod(int a, int b) {
		a %= b;
		a += b;
		a %= b;
		return a;
	}

	public static long trueMod(long a, long b) {
		a %= b;
		a += b;
		a %= b;
		return a;
	}

	public static long factorial(int n) {
		long result = 1;
		for (int i = 2; i <= n; i++)
			result *= i;
		return result;
	}

	public static long factorial(int n, long mod) {
		long result = 1;
		for (int i = 2; i <= n; i++)
			result = result * i % mod;
		return result % mod;
	}

	public static List<Pair<Long, Integer>> factorize(long number) {
		List<Pair<Long, Integer>> result = new ArrayList<Pair<Long, Integer>>();
		for (long i = 2; i * i <= number; i++) {
			if (number % i == 0) {
				int power = 0;
				do {
					power++;
					number /= i;
				} while (number % i == 0);
				result.add(Pair.makePair(i, power));
			}
		}
		if (number != 1)
			result.add(Pair.makePair(number, 1));
		return result;
	}

	public static List<Long> getDivisors(long number) {
		List<Pair<Long, Integer>> primeDivisors = factorize(number);
		return getDivisorsImpl(primeDivisors, 0, 1, new ArrayList<Long>());
	}

	private static List<Long> getDivisorsImpl(
			List<Pair<Long, Integer>> primeDivisors, int index, long current,
			List<Long> result) {
		if (index == primeDivisors.size()) {
			result.add(current);
			return result;
		}
		long p = primeDivisors.get(index).first;
		int power = primeDivisors.get(index).second;
		for (int i = 0; i <= power; i++) {
			getDivisorsImpl(primeDivisors, index + 1, current, result);
			current *= p;
		}
		return result;
	}

	public static long power(long base, long exponent) {
		if (exponent == 0)
			return 1;
		long result = power(base, exponent >> 1);
		result = result * result;
		if ((exponent & 1) != 0)
			result = result * base;
		return result;
	}

	public static long power(long base, long exponent, long mod) {
		if (base >= mod)
			base %= mod;
		if (exponent == 0)
			return 1 % mod;
		long result = power(base, exponent >> 1, mod);
		result = result * result % mod;
		if ((exponent & 1) != 0)
			result = result * base % mod;
		return result;
	}

	public static long lcm(long a, long b) {
		return a / gcd(a, b) * b;
	}

	public static long[] generateFibonacci(long upTo) {
		int count = 0;
		long last = 0;
		long current = 1;
		while (current <= upTo) {
			long next = last + current;
			last = current;
			current = next;
			count++;
		}
		return generateFibonacci(count, -1);
	}

	public static long[] generateFibonacci(int count, long module) {
		long[] result = new long[count];
		if (module == -1) {
			if (count != 0)
				result[0] = 1;
			if (count > 1)
				result[1] = 1;
			for (int i = 2; i < count; i++)
				result[i] = result[i - 1] + result[i - 2];
		} else {
			if (count != 0)
				result[0] = 1 % module;
			if (count > 1)
				result[1] = 1 % module;
			for (int i = 2; i < count; i++)
				result[i] = (result[i - 1] + result[i - 2]) % module;
		}
		return result;
	}

	public static long[] generateHappy(int digits) {
		long[] happy = new long[(1 << (digits + 1)) - 2];
		happy[0] = 4;
		happy[1] = 7;
		int first = 0;
		int last = 2;
		for (int i = 2; i <= digits; i++) {
			for (int j = 0; j < last - first; j++) {
				happy[last + 2 * j] = 10 * happy[first + j] + 4;
				happy[last + 2 * j + 1] = 10 * happy[first + j] + 7;
			}
			int next = last + 2 * (last - first);
			first = last;
			last = next;
		}
		return happy;
	}

	public static long[] generateFactorial(int count, long module) {
		long[] result = new long[count];
		if (module == -1) {
			if (count != 0)
				result[0] = 1;
			for (int i = 1; i < count; i++)
				result[i] = result[i - 1] * i;
		} else {
			if (count != 0)
				result[0] = 1 % module;
			for (int i = 1; i < count; i++)
				result[i] = (result[i - 1] * i) % module;
		}
		return result;
	}

	public static long reverse(long number, long module) {
		return power(number, module - 2, module);
	}

	public static boolean isPrime(long number) {
		if (number < 2)
			return false;
		for (long i = 2; i * i <= number; i++) {
			if (number % i == 0)
				return false;
		}
		return true;
	}

	public static long[] generateReverse(int upTo, long module) {
		long[] result = new long[upTo];
		if (upTo > 1)
			result[1] = 1;
		for (int i = 2; i < upTo; i++)
			result[i] = (module - module / i * result[((int) (module % i))]
					% module)
					% module;
		return result;
	}

	public static long[] generateReverseFactorials(int upTo, long module) {
		long[] result = generateReverse(upTo, module);
		if (upTo > 0)
			result[0] = 1;
		for (int i = 1; i < upTo; i++)
			result[i] = result[i] * result[i - 1] % module;
		return result;
	}

	public static long[] generatePowers(long base, int count, long mod) {
		long[] result = new long[count];
		if (count != 0)
			result[0] = 1 % mod;
		for (int i = 1; i < count; i++)
			result[i] = result[i - 1] * base % mod;
		return result;
	}

	public static long nextPrime(long from) {
		if (from <= 2)
			return 2;
		from += 1 - (from & 1);
		while (!isPrime(from))
			from += 2;
		return from;
	}

	public static long binomialCoefficient(int n, int m, long mod) {
		if (m < 0 || m > n)
			return 0;
		if (2 * m > n)
			m = n - m;
		long result = 1;
		for (int i = n - m + 1; i <= n; i++)
			result = result * i % mod;
		return result
				* BigInteger.valueOf(factorial(m, mod))
						.modInverse(BigInteger.valueOf(mod)).longValue() % mod;
	}

	public static boolean isSquare(long number) {
		long sqrt = Math.round(Math.sqrt(number));
		return sqrt * sqrt == number;
	}

	public static long findCommon(long aRemainder, long aMod, long bRemainder,
			long bMod) {
		long modGCD = gcd(aMod, bMod);
		long gcdRemainder = aRemainder % modGCD;
		if (gcdRemainder != bRemainder % modGCD)
			return -1;
		aMod /= modGCD;
		aRemainder /= modGCD;
		bMod /= modGCD;
		bRemainder /= modGCD;
		long aReverse = BigInteger.valueOf(aMod)
				.modInverse(BigInteger.valueOf(bMod)).longValue();
		long bReverse = BigInteger.valueOf(bMod)
				.modInverse(BigInteger.valueOf(aMod)).longValue();
		long mod = aMod * bMod;
		return (bReverse * aRemainder % mod * bMod + aReverse * bRemainder
				% mod * aMod)
				% mod * modGCD + gcdRemainder;
	}

	public static long[] generatePowers(long base, long maxValue) {
		if (maxValue <= 0)
			return new long[0];
		int size = 1;
		long current = 1;
		while (maxValue / base >= current) {
			current *= base;
			size++;
		}
		return generatePowers(base, size, Long.MAX_VALUE);
	}
}

interface Edge {
	public int getSource();

	public int getDestination();

	public long getWeight();

	public long getCapacity();

	public long getFlow();

	public void pushFlow(long flow);

	public boolean getFlag(int bit);

	public void setFlag(int bit);

	public void removeFlag(int bit);

	public int getTransposedID();

	public Edge getTransposedEdge();

	public int getReverseID();

	public Edge getReverseEdge();

	public int getID();

	public void remove();

	public void restore();
}

class Graph {
	public static final int REMOVED_BIT = 0;

	protected int vertexCount;
	protected int edgeCount;

	private int[] firstOutbound;
	private int[] firstInbound;

	private Edge[] edges;
	private int[] nextInbound;
	private int[] nextOutbound;
	private int[] from;
	private int[] to;
	private long[] weight;
	private long[] capacity;
	private int[] reverseEdge;
	private int[] flags;

	public Graph(int vertexCount) {
		this(vertexCount, vertexCount);
	}

	public Graph(int vertexCount, int edgeCapacity) {
		this.vertexCount = vertexCount;
		firstOutbound = new int[vertexCount];
		Arrays.fill(firstOutbound, -1);

		from = new int[edgeCapacity];
		to = new int[edgeCapacity];
		nextOutbound = new int[edgeCapacity];
		flags = new int[edgeCapacity];
	}

	public static Graph createGraph(int vertexCount, int[] from, int[] to) {
		Graph graph = new Graph(vertexCount, from.length);
		for (int i = 0; i < from.length; i++)
			graph.addSimpleEdge(from[i], to[i]);
		return graph;
	}

	public static Graph createWeightedGraph(int vertexCount, int[] from,
			int[] to, long[] weight) {
		Graph graph = new Graph(vertexCount, from.length);
		for (int i = 0; i < from.length; i++)
			graph.addWeightedEdge(from[i], to[i], weight[i]);
		return graph;
	}

	public static Graph createFlowGraph(int vertexCount, int[] from, int[] to,
			long[] capacity) {
		Graph graph = new Graph(vertexCount, from.length * 2);
		for (int i = 0; i < from.length; i++)
			graph.addFlowEdge(from[i], to[i], capacity[i]);
		return graph;
	}

	public static Graph createFlowWeightedGraph(int vertexCount, int[] from,
			int[] to, long[] weight, long[] capacity) {
		Graph graph = new Graph(vertexCount, from.length * 2);
		for (int i = 0; i < from.length; i++)
			graph.addFlowWeightedEdge(from[i], to[i], weight[i], capacity[i]);
		return graph;
	}

	public static Graph createTree(int[] parent) {
		Graph graph = new Graph(parent.length + 1, parent.length);
		for (int i = 0; i < parent.length; i++)
			graph.addSimpleEdge(parent[i], i + 1);
		return graph;
	}

	public int addEdge(int fromID, int toID, long weight, long capacity,
			int reverseEdge) {
		ensureEdgeCapacity(edgeCount + 1);
		if (firstOutbound[fromID] != -1)
			nextOutbound[edgeCount] = firstOutbound[fromID];
		else
			nextOutbound[edgeCount] = -1;
		firstOutbound[fromID] = edgeCount;
		if (firstInbound != null) {
			if (firstInbound[toID] != -1)
				nextInbound[edgeCount] = firstInbound[toID];
			else
				nextInbound[edgeCount] = -1;
			firstInbound[toID] = edgeCount;
		}
		this.from[edgeCount] = fromID;
		this.to[edgeCount] = toID;
		if (capacity != 0) {
			if (this.capacity == null)
				this.capacity = new long[from.length];
			this.capacity[edgeCount] = capacity;
		}
		if (weight != 0) {
			if (this.weight == null)
				this.weight = new long[from.length];
			this.weight[edgeCount] = weight;
		}
		if (reverseEdge != -1) {
			if (this.reverseEdge == null) {
				this.reverseEdge = new int[from.length];
				Arrays.fill(this.reverseEdge, 0, edgeCount, -1);
			}
			this.reverseEdge[edgeCount] = reverseEdge;
		}
		if (edges != null)
			edges[edgeCount] = createEdge(edgeCount);
		return edgeCount++;
	}

	protected final GraphEdge createEdge(int id) {
		return new GraphEdge(id);
	}

	public final int addFlowWeightedEdge(int from, int to, long weight,
			long capacity) {
		if (capacity == 0) {
			return addEdge(from, to, weight, 0, -1);
		} else {
			int lastEdgeCount = edgeCount;
			addEdge(to, from, -weight, 0, lastEdgeCount + entriesPerEdge());
			return addEdge(from, to, weight, capacity, lastEdgeCount);
		}
	}

	protected int entriesPerEdge() {
		return 1;
	}

	public final int addFlowEdge(int from, int to, long capacity) {
		return addFlowWeightedEdge(from, to, 0, capacity);
	}

	public final int addWeightedEdge(int from, int to, long weight) {
		return addFlowWeightedEdge(from, to, weight, 0);
	}

	public final int addSimpleEdge(int from, int to) {
		return addWeightedEdge(from, to, 0);
	}

	public final int vertexCount() {
		return vertexCount;
	}

	public final int edgeCount() {
		return edgeCount;
	}

	protected final int edgeCapacity() {
		return from.length;
	}

	public final Edge edge(int id) {
		initEdges();
		return edges[id];
	}

	public final int firstOutbound(int vertex) {
		int id = firstOutbound[vertex];
		while (id != -1 && isRemoved(id))
			id = nextOutbound[id];
		return id;
	}

	public final int nextOutbound(int id) {
		id = nextOutbound[id];
		while (id != -1 && isRemoved(id))
			id = nextOutbound[id];
		return id;
	}

	public final int firstInbound(int vertex) {
		initInbound();
		int id = firstInbound[vertex];
		while (id != -1 && isRemoved(id))
			id = nextInbound[id];
		return id;
	}

	public final int nextInbound(int id) {
		initInbound();
		id = nextInbound[id];
		while (id != -1 && isRemoved(id))
			id = nextInbound[id];
		return id;
	}

	public final int source(int id) {
		return from[id];
	}

	public final int destination(int id) {
		return to[id];
	}

	public final long weight(int id) {
		if (weight == null)
			return 0;
		return weight[id];
	}

	public final long capacity(int id) {
		if (capacity == null)
			return 0;
		return capacity[id];
	}

	public final long flow(int id) {
		if (reverseEdge == null)
			return 0;
		return capacity[reverseEdge[id]];
	}

	public final void pushFlow(int id, long flow) {
		if (flow == 0)
			return;
		if (flow > 0) {
			if (capacity(id) < flow)
				throw new IllegalArgumentException("Not enough capacity");
		} else {
			if (flow(id) < -flow)
				throw new IllegalArgumentException("Not enough capacity");
		}
		capacity[id] -= flow;
		capacity[reverseEdge[id]] += flow;
	}

	public int transposed(int id) {
		return -1;
	}

	public final int reverse(int id) {
		if (reverseEdge == null)
			return -1;
		return reverseEdge[id];
	}

	public final void addVertices(int count) {
		ensureVertexCapacity(vertexCount + count);
		Arrays.fill(firstOutbound, vertexCount, vertexCount + count, -1);
		if (firstInbound != null)
			Arrays.fill(firstInbound, vertexCount, vertexCount + count, -1);
		vertexCount += count;
	}

	protected final void initEdges() {
		if (edges == null) {
			edges = new Edge[from.length];
			for (int i = 0; i < edgeCount; i++)
				edges[i] = createEdge(i);
		}
	}

	public final void removeVertex(int vertex) {
		int id = firstOutbound[vertex];
		while (id != -1) {
			removeEdge(id);
			id = nextOutbound[id];
		}
		initInbound();
		id = firstInbound[vertex];
		while (id != -1) {
			removeEdge(id);
			id = nextInbound[id];
		}
	}

	private void initInbound() {
		if (firstInbound == null) {
			firstInbound = new int[firstOutbound.length];
			Arrays.fill(firstInbound, 0, vertexCount, -1);
			nextInbound = new int[from.length];
			for (int i = 0; i < edgeCount; i++) {
				nextInbound[i] = firstInbound[to[i]];
				firstInbound[to[i]] = i;
			}
		}
	}

	public final boolean flag(int id, int bit) {
		return (flags[id] >> bit & 1) != 0;
	}

	public final void setFlag(int id, int bit) {
		flags[id] |= 1 << bit;
	}

	public final void removeFlag(int id, int bit) {
		flags[id] &= -1 - (1 << bit);
	}

	public final void removeEdge(int id) {
		setFlag(id, REMOVED_BIT);
	}

	public final void restoreEdge(int id) {
		removeFlag(id, REMOVED_BIT);
	}

	public final boolean isRemoved(int id) {
		return flag(id, REMOVED_BIT);
	}

	public final Iterable<Edge> outbound(final int id) {
		initEdges();
		return new Iterable<Edge>() {
			public Iterator<Edge> iterator() {
				return new EdgeIterator(id, firstOutbound, nextOutbound);
			}
		};
	}

	public final Iterable<Edge> inbound(final int id) {
		initEdges();
		initInbound();
		return new Iterable<Edge>() {
			public Iterator<Edge> iterator() {
				return new EdgeIterator(id, firstInbound, nextInbound);
			}
		};
	}

	protected void ensureEdgeCapacity(int size) {
		if (from.length < size) {
			int newSize = Math.max(size, 2 * from.length);
			if (edges != null)
				edges = resize(edges, newSize);
			from = resize(from, newSize);
			to = resize(to, newSize);
			nextOutbound = resize(nextOutbound, newSize);
			if (nextInbound != null)
				nextInbound = resize(nextInbound, newSize);
			if (weight != null)
				weight = resize(weight, newSize);
			if (capacity != null)
				capacity = resize(capacity, newSize);
			if (reverseEdge != null)
				reverseEdge = resize(reverseEdge, newSize);
			flags = resize(flags, newSize);
		}
	}

	private void ensureVertexCapacity(int size) {
		if (firstOutbound.length < size) {
			int newSize = Math.max(size, 2 * from.length);
			firstOutbound = resize(firstOutbound, newSize);
			if (firstInbound != null)
				firstInbound = resize(firstInbound, newSize);
		}
	}

	protected final int[] resize(int[] array, int size) {
		int[] newArray = new int[size];
		System.arraycopy(array, 0, newArray, 0, array.length);
		return newArray;
	}

	private long[] resize(long[] array, int size) {
		long[] newArray = new long[size];
		System.arraycopy(array, 0, newArray, 0, array.length);
		return newArray;
	}

	private Edge[] resize(Edge[] array, int size) {
		Edge[] newArray = new Edge[size];
		System.arraycopy(array, 0, newArray, 0, array.length);
		return newArray;
	}

	public final boolean isSparse() {
		return vertexCount == 0 || edgeCount * 20 / vertexCount <= vertexCount;
	}

	protected class GraphEdge implements Edge {
		protected int id;

		protected GraphEdge(int id) {
			this.id = id;
		}

		public int getSource() {
			return source(id);
		}

		public int getDestination() {
			return destination(id);
		}

		public long getWeight() {
			return weight(id);
		}

		public long getCapacity() {
			return capacity(id);
		}

		public long getFlow() {
			return flow(id);
		}

		public void pushFlow(long flow) {
			Graph.this.pushFlow(id, flow);
		}

		public boolean getFlag(int bit) {
			return flag(id, bit);
		}

		public void setFlag(int bit) {
			Graph.this.setFlag(id, bit);
		}

		public void removeFlag(int bit) {
			Graph.this.removeFlag(id, bit);
		}

		public int getTransposedID() {
			return transposed(id);
		}

		public Edge getTransposedEdge() {
			int reverseID = getTransposedID();
			if (reverseID == -1)
				return null;
			initEdges();
			return edge(reverseID);
		}

		public int getReverseID() {
			return reverse(id);
		}

		public Edge getReverseEdge() {
			int reverseID = getReverseID();
			if (reverseID == -1)
				return null;
			initEdges();
			return edge(reverseID);
		}

		public int getID() {
			return id;
		}

		public void remove() {
			removeEdge(id);
		}

		public void restore() {
			restoreEdge(id);
		}
	}

	public class EdgeIterator implements Iterator<Edge> {
		private int edgeID;
		private final int[] next;
		private int lastID = -1;

		public EdgeIterator(int id, int[] first, int[] next) {
			this.next = next;
			edgeID = nextEdge(first[id]);
		}

		private int nextEdge(int id) {
			while (id != -1 && isRemoved(id))
				id = next[id];
			return id;
		}

		public boolean hasNext() {
			return edgeID != -1;
		}

		public Edge next() {
			if (edgeID == -1)
				throw new NoSuchElementException();
			lastID = edgeID;
			edgeID = nextEdge(next[lastID]);
			return edges[lastID];
		}

		public void remove() {
			if (lastID == -1)
				throw new IllegalStateException();
			removeEdge(lastID);
			lastID = -1;
		}
	}

}

class BidirectionalGraph extends Graph {
	public int[] transposedEdge;

	public BidirectionalGraph(int vertexCount) {
		this(vertexCount, vertexCount);
	}

	public BidirectionalGraph(int vertexCount, int edgeCapacity) {
		super(vertexCount, 2 * edgeCapacity);
		transposedEdge = new int[2 * edgeCapacity];
	}

	public static BidirectionalGraph createGraph(int vertexCount, int[] from,
			int[] to) {
		BidirectionalGraph graph = new BidirectionalGraph(vertexCount,
				from.length);
		for (int i = 0; i < from.length; i++)
			graph.addSimpleEdge(from[i], to[i]);
		return graph;
	}

	public static BidirectionalGraph createWeightedGraph(int vertexCount,
			int[] from, int[] to, long[] weight) {
		BidirectionalGraph graph = new BidirectionalGraph(vertexCount,
				from.length);
		for (int i = 0; i < from.length; i++)
			graph.addWeightedEdge(from[i], to[i], weight[i]);
		return graph;
	}

	public static BidirectionalGraph createFlowGraph(int vertexCount,
			int[] from, int[] to, long[] capacity) {
		BidirectionalGraph graph = new BidirectionalGraph(vertexCount,
				from.length * 2);
		for (int i = 0; i < from.length; i++)
			graph.addFlowEdge(from[i], to[i], capacity[i]);
		return graph;
	}

	public static BidirectionalGraph createFlowWeightedGraph(int vertexCount,
			int[] from, int[] to, long[] weight, long[] capacity) {
		BidirectionalGraph graph = new BidirectionalGraph(vertexCount,
				from.length * 2);
		for (int i = 0; i < from.length; i++)
			graph.addFlowWeightedEdge(from[i], to[i], weight[i], capacity[i]);
		return graph;
	}

	@Override
	public int addEdge(int fromID, int toID, long weight, long capacity,
			int reverseEdge) {
		int lastEdgeCount = edgeCount;
		super.addEdge(fromID, toID, weight, capacity, reverseEdge);
		super.addEdge(toID, fromID, weight, capacity, reverseEdge == -1 ? -1
				: reverseEdge + 1);
		this.transposedEdge[lastEdgeCount] = lastEdgeCount + 1;
		this.transposedEdge[lastEdgeCount + 1] = lastEdgeCount;
		return lastEdgeCount;
	}

	@Override
	protected int entriesPerEdge() {
		return 2;
	}

	@Override
	public final int transposed(int id) {
		return transposedEdge[id];
	}

	@Override
	protected void ensureEdgeCapacity(int size) {
		if (size > edgeCapacity()) {
			super.ensureEdgeCapacity(size);
			transposedEdge = resize(transposedEdge, edgeCapacity());
		}
	}
}

interface IntComparator extends Comparator<Integer> {
	public static final IntComparator DEFAULT = new IntComparator() {
		public int compare(Integer first, Integer second) {
			if (first < second)
				return -1;
			if (first > second)
				return 1;
			return 0;
		}
	};

	public static final IntComparator REVERSE = new IntComparator() {
		public int compare(Integer first, Integer second) {
			if (first < second)
				return 1;
			if (first > second)
				return -1;
			return 0;
		}
	};

	public int compare(Integer first, Integer second);
}

interface IndependentSetSystem {
	public boolean join(int first, int second);

	public int get(int index);

	public int getSetCount();

	public void setListener(Listener listener);

	public static interface Listener {
		public void joined(int joinedRoot, int root);
	}
}

class RecursiveIndependentSetSystem implements IndependentSetSystem {
	private final int[] color;
	private final int[] rank;
	private int setCount;
	private Listener listener;

	public RecursiveIndependentSetSystem(int size) {
		color = new int[size];
		rank = new int[size];
		for (int i = 0; i < size; i++)
			color[i] = i;
		setCount = size;
	}

	public RecursiveIndependentSetSystem(RecursiveIndependentSetSystem other) {
		color = other.color.clone();
		rank = other.rank.clone();
		setCount = other.setCount;
	}

	public boolean join(int first, int second) {
		first = get(first);
		second = get(second);
		if (first == second)
			return false;
		if (rank[first] < rank[second]) {
			int temp = first;
			first = second;
			second = temp;
		} else if (rank[first] == rank[second])
			rank[first]++;
		setCount--;
		color[second] = first;
		if (listener != null)
			listener.joined(second, first);
		return true;
	}

	public int get(int index) {
		if (color[index] == index)
			return index;
		return color[index] = get(color[index]);
	}

	public int getSetCount() {
		return setCount;
	}

	public void setListener(Listener listener) {
		this.listener = listener;
	}
}

class Pair<U, V> implements Comparable<Pair<U, V>> {
	public final U first;
	public final V second;

	public static <U, V> Pair<U, V> makePair(U first, V second) {
		return new Pair<U, V>(first, second);
	}

	private Pair(U first, V second) {
		this.first = first;
		this.second = second;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o)
			return true;
		if (o == null || getClass() != o.getClass())
			return false;

		Pair pair = (Pair) o;

		return !(first != null ? !first.equals(pair.first) : pair.first != null)
				&& !(second != null ? !second.equals(pair.second)
						: pair.second != null);

	}

	@Override
	public int hashCode() {
		int result = first != null ? first.hashCode() : 0;
		result = 31 * result + (second != null ? second.hashCode() : 0);
		return result;
	}

	public Pair<V, U> swap() {
		return makePair(second, first);
	}

	@Override
	public String toString() {
		return "(" + first + "," + second + ")";
	}

	@SuppressWarnings({ "unchecked" })
	public int compareTo(Pair<U, V> o) {
		int value = ((Comparable<U>) first).compareTo(o.first);
		if (value != 0)
			return value;
		return ((Comparable<V>) second).compareTo(o.second);
	}
}

class ArrayUtils {

	public static void sort(int[] array, IntComparator comparator) {
		Integer[] aux = new Integer[array.length];
		Arrays.sort(aux, comparator);
		for (int i = 0; i < aux.length; i++)
			array[i] = aux[i];
	}

	public static void sort(int[] array) {
		sort(array, IntComparator.DEFAULT);
	}

}

class StringUtils {
	public static String reverse(String sample) {
		StringBuilder result = new StringBuilder(sample);
		result.reverse();
		return result.toString();
	}

	public static int count(String string, char c) {
		int count = 0;
		for (int i = string.length() - 1; i >= 0; i--) {
			if (string.charAt(i) == c) {
				count++;
			}
		}
		return count;
	}

	public static String unite(String[] array) {
		StringBuilder result = new StringBuilder();
		for (String s : array) {
			result.append(s);
		}
		return result.toString();
	}

	public static int differs(String first, String second) {
		int result = 0;
		for (int i = 0; i < first.length(); i++) {
			if (first.charAt(i) != second.charAt(i)) {
				result++;
			}
		}
		return result;
	}

	public static int[] zAlgorithm(CharSequence s) {
		int length = s.length();
		int[] z = new int[length];
		int left = 0, right = 0;
		for (int i = 1; i < length; i++) {
			if (i > right) {
				int j;
				// noinspection StatementWithEmptyBody
				for (j = 0; i + j < length && s.charAt(i + j) == s.charAt(j); j++)
					;
				z[i] = j;
				left = i;
				right = i + j - 1;
			} else if (z[i - left] < right - i + 1)
				z[i] = z[i - left];
			else {
				int j;
				// noinspection StatementWithEmptyBody
				for (j = 1; right + j < length
						&& s.charAt(right + j) == s.charAt(right - i + j); j++)
					;
				z[i] = right - i + j;
				left = i;
				right = right + j - 1;
			}
		}
		return z;
	}

	public static int[] prefixFunction(CharSequence s) {
		int l = s.length();
		int[] p = new int[l];
		int k = 0;
		for (int i = 1; i < l; i++) {
			while ((k > 0) && (s.charAt(k) != s.charAt(i)))
				k = p[k - 1];
			if (s.charAt(k) == s.charAt(i))
				k++;
			p[i] = k;
		}
		return p;
	}

	public static int[] suffixArray(CharSequence s) {
		int length = s.length();
		int[] result = new int[length];
		for (int i = 0; i < length; i++)
			result[i] = length - i - 1;
		final long[] type = new long[length];
		for (int i = 0; i < length; i++)
			type[i] = s.charAt(i);
		final long[] nextType = new long[length];
		int curLength = 1;
		ArrayUtils.sort(result, new IntComparator() {
			public int compare(Integer first, Integer second) {
				return IntegerUtils.longCompare(type[first], type[second]);
			}
		});
		while (curLength < length) {
			for (int i = 0; i < length; i++)
				nextType[i] = (type[i] << 32)
						+ (i + curLength < length ? type[i + curLength] : -1);
			ArrayUtils.sort(result, new IntComparator() {
				public int compare(Integer first, Integer second) {
					return IntegerUtils.longCompare(nextType[first],
							nextType[second]);
				}
			});
			long currentType = nextType[result[0]];
			long currentIndex = 0;
			for (int i = 0; i < length; i++) {
				if (nextType[result[i]] != currentType) {
					currentIndex++;
					currentType = nextType[result[i]];
				}
				type[result[i]] = currentIndex;
			}
			curLength <<= 1;
		}
		return result;
	}

	public static int[][] buildPrefixAutomaton(CharSequence s) {
		return buildPrefixAutomaton(s, 'a', 'z');
	}

	public static int[][] buildPrefixAutomaton(CharSequence s, char from,
			char to) {
		int[] prefixFunction = prefixFunction(s);
		int length = to - from + 1;
		int[][] result = new int[s.length() + 1][length];
		result[0][s.charAt(0) - from] = 1;
		for (int i = 1; i <= s.length(); i++) {
			System.arraycopy(result[prefixFunction[i - 1]], 0, result[i], 0,
					length);
			if (i != s.length())
				result[i][s.charAt(i) - from] = i + 1;
		}
		return result;
	}

	public static boolean contains(final String s, final String target) {
		int[] z = zAlgorithm(new CharSequence() {
			public int length() {
				return s.length() + target.length();
			}

			public char charAt(int index) {
				if (index < target.length())
					return target.charAt(index);
				return s.charAt(index - target.length());
			}

			public CharSequence subSequence(int start, int end) {
				throw new UnsupportedOperationException();
			}
		});
		for (int i = target.length(); i < z.length; i++) {
			if (z[i] >= target.length())
				return true;
		}
		return false;
	}

	public static int[] suffixArray(String s) {
		int length = s.length();
		int[] position = new int[length];
		int[] count = new int[Math.max(256, length)];
		int[] order = new int[length];
		for (int i = 0; i < length; ++i)
			count[s.charAt(i)]++;
		for (int i = 1; i < 256; ++i)
			count[i] += count[i - 1];
		for (int i = 0; i < length; ++i)
			position[--count[s.charAt(i)]] = i;
		order[position[0]] = 0;
		int currentClass = 0;
		for (int i = 1; i < length; ++i) {
			if (s.charAt(position[i]) != s.charAt(position[i - 1]))
				currentClass++;
			order[position[i]] = currentClass;
		}
		int[] nextPosition = new int[length];
		int[] nextOrder = new int[length];
		for (int h = 0; (1 << h) < length; h++) {
			for (int i = 0; i < length; ++i) {
				nextPosition[i] = position[i] - (1 << h);
				if (nextPosition[i] < 0)
					nextPosition[i] += length;
			}
			Arrays.fill(count, 0);
			for (int i = 0; i < length; ++i)
				count[order[nextPosition[i]]]++;
			for (int i = 1; i < currentClass; ++i)
				count[i] += count[i - 1];
			for (int i = length - 1; i >= 0; --i)
				position[--count[order[nextPosition[i]]]] = nextPosition[i];
			nextOrder[position[0]] = 0;
			currentClass = 0;
			for (int i = 1; i < length; ++i) {
				int mid1 = (position[i] + (1 << h));
				if (mid1 >= length)
					mid1 -= length;
				int mid2 = (position[i - 1] + (1 << h));
				if (mid2 >= length)
					mid2 -= length;
				if (order[position[i]] != order[position[i - 1]]
						|| order[mid1] != order[mid2])
					currentClass++;
				nextOrder[position[i]] = currentClass;
			}
			System.arraycopy(nextOrder, 0, order, 0, length);
		}
		return order;
	}
}

class MaxFlow {
	private final Graph graph;
	private int source;
	private int destination;
	private int[] queue;
	private int[] distance;
	private int[] nextEdge;

	private MaxFlow(Graph graph, int source, int destination) {
		this.graph = graph;
		this.source = source;
		this.destination = destination;
		int vertexCount = graph.vertexCount();
		queue = new int[vertexCount];
		distance = new int[vertexCount];
		nextEdge = new int[vertexCount];
	}

	public static long dinic(Graph graph, int source, int destination) {
		return new MaxFlow(graph, source, destination).dinic();
	}

	private long dinic() {
		long totalFlow = 0;
		while (true) {
			edgeDistances();
			if (distance[destination] == -1)
				break;
			Arrays.fill(nextEdge, -2);
			totalFlow += dinicImpl(source, Long.MAX_VALUE);
		}
		return totalFlow;
	}

	private void edgeDistances() {
		Arrays.fill(distance, -1);
		distance[source] = 0;
		int size = 1;
		queue[0] = source;
		for (int i = 0; i < size; i++) {
			int current = queue[i];
			int id = graph.firstOutbound(current);
			while (id != -1) {
				if (graph.capacity(id) != 0) {
					int next = graph.destination(id);
					if (distance[next] == -1) {
						distance[next] = distance[current] + 1;
						queue[size++] = next;
					}
				}
				id = graph.nextOutbound(id);
			}
		}
	}

	private long dinicImpl(int source, long flow) {
		if (source == destination)
			return flow;
		if (flow == 0 || distance[source] == distance[destination])
			return 0;
		int id = nextEdge[source];
		if (id == -2)
			nextEdge[source] = id = graph.firstOutbound(source);
		long totalPushed = 0;
		while (id != -1) {
			int nextDestinationID = graph.destination(id);
			if (graph.capacity(id) != 0
					&& distance[nextDestinationID] == distance[source] + 1) {
				long pushed = dinicImpl(nextDestinationID,
						Math.min(flow, graph.capacity(id)));
				if (pushed != 0) {
					graph.pushFlow(id, pushed);
					flow -= pushed;
					totalPushed += pushed;
					if (flow == 0)
						return totalPushed;
				}
			}
			nextEdge[source] = id = graph.nextOutbound(id);
		}
		return totalPushed;
	}
}

class Heap {
	private IntComparator comparator;
	private int size = 0;
	private int[] elements;
	private int[] at;

	public Heap(int maxElement) {
		this(10, maxElement);
	}

	public Heap(IntComparator comparator, int maxElement) {
		this(10, comparator, maxElement);
	}

	public Heap(int capacity, int maxElement) {
		this(capacity, IntComparator.DEFAULT, maxElement);
	}

	public Heap(int capacity, IntComparator comparator, int maxElement) {
		this.comparator = comparator;
		elements = new int[capacity];
		at = new int[maxElement];
		Arrays.fill(at, -1);
	}

	public int getSize() {
		return size;
	}

	public void setComparator(IntComparator comparator) {
		this.comparator = comparator;
	}

	public boolean isEmpty() {
		return size == 0;
	}

	public int add(int element) {
		ensureCapacity(size + 1);
		elements[size] = element;
		at[element] = size;
		shiftUp(size++);
		return at[element];
	}

	public void shiftUp(int index) {
		// if (index < 0 || index >= size)
		// throw new IllegalArgumentException();
		int value = elements[index];
		while (index != 0) {
			int parent = (index - 1) >>> 1;
			int parentValue = elements[parent];
			if (comparator.compare(parentValue, value) <= 0) {
				elements[index] = value;
				at[value] = index;
				return;
			}
			elements[index] = parentValue;
			at[parentValue] = index;
			index = parent;
		}
		elements[0] = value;
		at[value] = 0;
	}

	public void shiftDown(int index) {
		if (index < 0 || index >= size)
			throw new IllegalArgumentException();
		while (true) {
			int child = (index << 1) + 1;
			if (child >= size)
				return;
			if (child + 1 < size
					&& comparator.compare(elements[child], elements[child + 1]) > 0)
				child++;
			if (comparator.compare(elements[index], elements[child]) <= 0)
				return;
			swap(index, child);
			index = child;
		}
	}

	public int getIndex(int element) {
		return at[element];
	}

	private void swap(int first, int second) {
		int temp = elements[first];
		elements[first] = elements[second];
		elements[second] = temp;
		at[elements[first]] = first;
		at[elements[second]] = second;
	}

	private void ensureCapacity(int size) {
		if (elements.length < size) {
			int[] oldElements = elements;
			elements = new int[Math.max(2 * elements.length, size)];
			System.arraycopy(oldElements, 0, elements, 0, this.size);
		}
	}

	public int peek() {
		if (isEmpty())
			throw new IndexOutOfBoundsException();
		return elements[0];
	}

	public int poll() {
		if (isEmpty())
			throw new IndexOutOfBoundsException();
		int result = elements[0];
		at[result] = -1;
		if (size == 1) {
			size = 0;
			return result;
		}
		elements[0] = elements[--size];
		at[elements[0]] = 0;
		shiftDown(0);
		return result;
	}

	public void clear() {
		size = 0;
		Arrays.fill(at, -1);
	}
}

class ShortestDistance {
	public static Pair<long[], int[]> dijkstraAlgorithm(Graph graph, int source) {
		int vertexCount = graph.vertexCount();
		final long[] distance = new long[vertexCount];
		int[] last = new int[vertexCount];
		Arrays.fill(distance, Long.MAX_VALUE);
		Arrays.fill(last, -1);
		distance[source] = 0;
		if (graph.isSparse()) {
			Heap heap = new Heap(vertexCount, new IntComparator() {
				public int compare(Integer first, Integer second) {
					return IntegerUtils.longCompare(distance[first],
							distance[second]);
				}
			}, vertexCount);
			heap.add(source);
			while (!heap.isEmpty()) {
				int current = heap.poll();
				int id = graph.firstOutbound(current);
				while (id != -1) {
					int next = graph.destination(id);
					long total = graph.weight(id) + distance[current];
					if (distance[next] > total) {
						distance[next] = total;
						if (heap.getIndex(next) == -1)
							heap.add(next);
						else
							heap.shiftUp(heap.getIndex(next));
						last[next] = id;
					}
					id = graph.nextOutbound(id);
				}
			}
		} else {
			boolean[] visited = new boolean[vertexCount];
			for (int i = 0; i < vertexCount; i++) {
				int index = -1;
				long length = Long.MAX_VALUE;
				for (int j = 0; j < vertexCount; j++) {
					if (!visited[j] && distance[j] < length) {
						length = distance[j];
						index = j;
					}
				}
				if (index == -1)
					break;
				visited[index] = true;
				int id = graph.firstOutbound(index);
				while (id != -1) {
					int next = graph.destination(id);
					if (!visited[next]) {
						long total = graph.weight(id) + length;
						if (distance[next] > total) {
							distance[next] = total;
							last[next] = id;
						}
					}
					id = graph.nextOutbound(id);
				}
			}
		}
		return Pair.makePair(distance, last);
	}

	public static Pair<Long, List<Integer>> dijkstraAlgorithm(Graph graph,
			int source, int destination) {
		if (source == destination)
			return Pair.makePair(0L, (List<Integer>) new ArrayList<Integer>());
		Pair<long[], int[]> result = dijkstraAlgorithm(graph, source);
		if (result.second[destination] == -1)
			return null;
		List<Integer> path = new ArrayList<Integer>();
		int id = destination;
		while (id != source) {
			path.add(result.second[id]);
			id = graph.source(result.second[id]);
		}
		Collections.reverse(path);
		return Pair.makePair(result.first[destination], path);
	}
}

class ReverseComparator<T extends Comparable<T>> implements Comparator<T> {
	public int compare(T o1, T o2) {
		return o2.compareTo(o1);
	}
}

class Indexer<K> extends TreeMap<K, Integer> {
	private int index = 0;

	@Override
	public Integer get(Object key) {
		if (!containsKey(key))
			put((K) key, index++);
		return super.get(key);
	}
}

class Counter<K> extends TreeMap<K, Long> {
	public Counter() {
		super();
	}

	public Counter(int capacity) {
		super();
	}

	public long add(K key) {
		long result = get(key);
		put(key, result + 1);
		return result + 1;
	}

	public void add(K key, long delta) {
		put(key, get(key) + delta);
	}

	@Override
	public Long get(Object key) {
		if (containsKey(key))
			return super.get(key);
		return 0L;
	}
}

interface StringHash {
	long hash(int from, int to);

	long hash(int from);

	int length();
}

abstract class AbstractStringHash implements StringHash {
	public static final long MULTIPLIER;
	protected static final long FIRST_REVERSE_MULTIPLIER;
	protected static final long SECOND_REVERSE_MULTIPLIER;
	public static final long FIRST_MOD;
	public static final long SECOND_MOD;

	static {
		Random random = new Random(System.currentTimeMillis());
		FIRST_MOD = IntegerUtils.nextPrime((long) (1e9 + random
				.nextInt((int) 1e9)));
		SECOND_MOD = IntegerUtils.nextPrime((long) (1e9 + random
				.nextInt((int) 1e9)));
		MULTIPLIER = random.nextInt((int) 1e9 - 257) + 257;
		FIRST_REVERSE_MULTIPLIER = IntegerUtils.reverse(MULTIPLIER, FIRST_MOD);
		SECOND_REVERSE_MULTIPLIER = IntegerUtils
				.reverse(MULTIPLIER, SECOND_MOD);
	}

	public long hash(int from) {
		return hash(from, length());
	}
}

class SimpleStringHash extends AbstractStringHash {
	private static long[] firstReversePower = new long[0];
	private static long[] secondReversePower = new long[0];

	private final long[] firstHash;
	private final long[] secondHash;

	public SimpleStringHash(CharSequence string) {
		int length = string.length();
		ensureCapacity(length);
		firstHash = new long[length + 1];
		secondHash = new long[length + 1];
		long firstPower = 1;
		long secondPower = 1;
		for (int i = 0; i < length; i++) {
			firstHash[i + 1] = (firstHash[i] + string.charAt(i) * firstPower)
					% FIRST_MOD;
			secondHash[i + 1] = (secondHash[i] + string.charAt(i) * secondPower)
					% SECOND_MOD;
			firstPower *= MULTIPLIER;
			firstPower %= FIRST_MOD;
			secondPower *= MULTIPLIER;
			secondPower %= SECOND_MOD;
		}
	}

	private void ensureCapacity(int length) {
		if (firstReversePower.length >= length)
			return;
		length = Math.max(length + 1, firstReversePower.length << 1);
		long[] oldFirst = firstReversePower;
		long[] oldSecond = secondReversePower;
		firstReversePower = new long[length];
		secondReversePower = new long[length];
		System.arraycopy(oldFirst, 0, firstReversePower, 0, oldFirst.length);
		System.arraycopy(oldSecond, 0, secondReversePower, 0, oldSecond.length);
		firstReversePower[0] = secondReversePower[0] = 1;
		for (int i = Math.max(oldFirst.length, 1); i < length; i++) {
			firstReversePower[i] = firstReversePower[i - 1]
					* FIRST_REVERSE_MULTIPLIER % FIRST_MOD;
			secondReversePower[i] = secondReversePower[i - 1]
					* SECOND_REVERSE_MULTIPLIER % SECOND_MOD;
		}
	}

	public long hash(int from, int to) {
		return (((firstHash[to] - firstHash[from] + FIRST_MOD)
				* firstReversePower[from] % FIRST_MOD) << 32)
				+ ((secondHash[to] - secondHash[from] + SECOND_MOD)
						* secondReversePower[from] % SECOND_MOD);
	}

	public int length() {
		return firstHash.length - 1;
	}
}

class SubstringAutomaton {
	public int[][] edges;
	public int[] ends;

	public SubstringAutomaton(String[] words) {
		this(words, 'a', 'z');
	}

	public SubstringAutomaton(String[] words, char first, char last) {
		Indexer<Long> indexer = new Indexer<>();
		Counter<Long> fullWords = new Counter<>();
		StringHash[] hashes = new StringHash[words.length];
		int totalLength = 0;
		for (int i = 0; i < words.length; i++) {
			String s = words[i];
			hashes[i] = new SimpleStringHash(s);
			for (int j = 0; j <= s.length(); j++)
				indexer.get(hashes[i].hash(0, j));
			fullWords.add(hashes[i].hash(0));
			totalLength += s.length();
		}
		int size = indexer.size();
		edges = new int[size][last - first + 1];
		ends = new int[size];
		int[] link = new int[size];
		Arrays.fill(link, -1);
		int[] start = new int[size];
		Arrays.fill(start, -1);
		int[] next = new int[totalLength];
		int[] to = new int[totalLength];
		int index = 0;
		Graph graph = new Graph(size);
		int[] length = new int[size];
		for (int i = 0; i < words.length; i++) {
			String s = words[i];
			for (int j = 0; j <= s.length(); j++) {
				int at = indexer.get(hashes[i].hash(0, j));
				if (j != s.length()) {
					to[index] = i;
					next[index] = start[at];
					start[at] = index++;
				}
				if (link[at] == -1) {
					length[at] = j;
					for (int k = 1; k <= j; k++) {
						long key = hashes[i].hash(k, j);
						if (indexer.containsKey(key)) {
							link[at] = indexer.get(key);
							graph.addSimpleEdge(link[at], at);
							break;
						}
					}
					for (int k = 0; k <= j; k++)
						ends[at] += fullWords.get(hashes[i].hash(k, j));
				}
			}
		}
		int[] queue = new int[size];
		int count = 1;
		for (int i = 0; i < count; i++) {
			int current = queue[i];
			for (int j = start[current]; j != -1; j = next[j]) {
				int at = to[j];
				edges[current][words[at].charAt(length[current]) - first] = indexer
						.get(hashes[at].hash(0, length[current] + 1));
			}
			for (int j = graph.firstOutbound(current); j != -1; j = graph
					.nextOutbound(j)) {
				int at = graph.destination(j);
				queue[count++] = at;
				System.arraycopy(edges[current], 0, edges[at], 0, last - first
						+ 1);
			}
		}
	}
}

class MinCostFlow {
	private final Graph graph;
	private final int source;
	private final int destination;
	private final long[] phi;
	private final long[] dijkstraResult;
	private final int[] lastEdge;
	private final Heap heap;
	private final int vertexCount;
	private final int[] visited;
	private int visitIndex;

	public MinCostFlow(Graph graph, int source, int destination,
			boolean hasNegativeEdges) {
		this.graph = graph;
		this.source = source;
		this.destination = destination;
		vertexCount = graph.vertexCount();
		phi = new long[vertexCount];
		if (hasNegativeEdges)
			fordBellman();
		dijkstraResult = new long[vertexCount];
		lastEdge = new int[vertexCount];
		if (graph.isSparse()) {
			heap = new Heap(vertexCount, new IntComparator() {
				public int compare(Integer first, Integer second) {
					return IntegerUtils.longCompare(dijkstraResult[first],
							dijkstraResult[second]);
				}
			}, vertexCount);
			visited = null;
		} else {
			heap = null;
			visited = new int[vertexCount];
		}
	}

	private void fordBellman() {
		Arrays.fill(phi, Long.MAX_VALUE);
		phi[source] = 0;
		boolean[] inQueue = new boolean[vertexCount];
		int[] queue = new int[vertexCount + 1];
		queue[0] = source;
		inQueue[source] = true;
		int stepCount = 0;
		int head = 0;
		int end = 1;
		int maxSteps = 2 * vertexCount * vertexCount;
		while (head != end) {
			int vertex = queue[head++];
			if (head == queue.length)
				head = 0;
			inQueue[vertex] = false;
			int edgeID = graph.firstOutbound(vertex);
			while (edgeID != -1) {
				long total = phi[vertex] + graph.weight(edgeID);
				int destination = graph.destination(edgeID);
				if (graph.capacity(edgeID) != 0 && phi[destination] > total) {
					phi[destination] = total;
					if (!inQueue[destination]) {
						queue[end++] = destination;
						inQueue[destination] = true;
						if (end == queue.length)
							end = 0;
					}
				}
				edgeID = graph.nextOutbound(edgeID);
			}
			if (++stepCount > maxSteps)
				throw new IllegalArgumentException(
						"Graph contains negative cycle");
		}
	}

	public static Pair<Long, Long> minCostMaxFlow(Graph graph, int source,
			int destination, boolean hasNegativeEdges) {
		return new MinCostFlow(graph, source, destination, hasNegativeEdges)
				.minCostMaxFlow();
	}

	public static Pair<Long, Long> minCostMaxFlow(Graph graph, int source,
			int destination, boolean hasNegativeEdges, long maxFlow) {
		return new MinCostFlow(graph, source, destination, hasNegativeEdges)
				.minCostMaxFlow(maxFlow);
	}

	public Pair<Long, Long> minCostMaxFlow() {
		return minCostMaxFlow(Long.MAX_VALUE);
	}

	public Pair<Long, Long> minCostMaxFlow(long maxFlow) {
		long cost = 0;
		long flow = 0;
		while (maxFlow != 0) {
			if (graph.isSparse())
				dijkstraAlgorithm();
			else
				dijkstraAlgorithmFull();
			if (lastEdge[destination] == -1)
				return Pair.makePair(cost, flow);
			for (int i = 0; i < dijkstraResult.length; i++) {
				if (dijkstraResult[i] != Long.MAX_VALUE)
					phi[i] += dijkstraResult[i];
			}
			int vertex = destination;
			long currentFlow = maxFlow;
			long currentCost = 0;
			while (vertex != source) {
				int edgeID = lastEdge[vertex];
				currentFlow = Math.min(currentFlow, graph.capacity(edgeID));
				currentCost += graph.weight(edgeID);
				vertex = graph.source(edgeID);
			}
			maxFlow -= currentFlow;
			cost += currentCost * currentFlow;
			flow += currentFlow;
			vertex = destination;
			while (vertex != source) {
				int edgeID = lastEdge[vertex];
				graph.pushFlow(edgeID, currentFlow);
				vertex = graph.source(edgeID);
			}
		}
		return Pair.makePair(cost, flow);
	}

	private void dijkstraAlgorithm() {
		Arrays.fill(dijkstraResult, Long.MAX_VALUE);
		Arrays.fill(lastEdge, -1);
		dijkstraResult[source] = 0;
		heap.add(source);
		while (!heap.isEmpty()) {
			int current = heap.poll();
			int edgeID = graph.firstOutbound(current);
			while (edgeID != -1) {
				if (graph.capacity(edgeID) != 0) {
					int next = graph.destination(edgeID);
					long total = graph.weight(edgeID) - phi[next]
							+ phi[current] + dijkstraResult[current];
					if (dijkstraResult[next] > total) {
						dijkstraResult[next] = total;
						if (heap.getIndex(next) == -1)
							heap.add(next);
						else
							heap.shiftUp(heap.getIndex(next));
						lastEdge[next] = edgeID;
					}
				}
				edgeID = graph.nextOutbound(edgeID);
			}
		}
	}

	private void dijkstraAlgorithmFull() {
		visitIndex++;
		Arrays.fill(dijkstraResult, Long.MAX_VALUE);
		lastEdge[destination] = -1;
		dijkstraResult[source] = 0;
		for (int i = 0; i < vertexCount; i++) {
			int index = -1;
			long length = Long.MAX_VALUE;
			for (int j = 0; j < vertexCount; j++) {
				if (visited[j] != visitIndex && dijkstraResult[j] < length) {
					length = dijkstraResult[j];
					index = j;
				}
			}
			if (index == -1) {
				return;
			}
			visited[index] = visitIndex;
			int edgeID = graph.firstOutbound(index);
			while (edgeID != -1) {
				if (graph.capacity(edgeID) != 0) {
					int next = graph.destination(edgeID);
					if (visited[next] != visitIndex) {
						long total = graph.weight(edgeID) - phi[next]
								+ phi[index] + length;
						if (dijkstraResult[next] > total) {
							dijkstraResult[next] = total;
							lastEdge[next] = edgeID;
						}
					}
				}
				edgeID = graph.nextOutbound(edgeID);
			}
		}
	}
}

abstract class IntList {
	public abstract int get(int index);

	public abstract void set(int index, int value);

	public abstract int size();

	public abstract void add(int value);
}

class SuffixAutomaton {
	public final int[] length;
	public final int[] link;
	public final int[] first;
	public final int[] next;
	public final int[] to;
	public final int[] label;
	public int size;
	public int last;
	public int edgeSize;

	public SuffixAutomaton(final CharSequence s) {
		this(new IntList() {
			@Override
			public int get(int index) {
				return s.charAt(index);
			}

			public void set(int index, int value) {
				throw new UnsupportedOperationException();
			}

			@Override
			public int size() {
				return s.length();
			}

			public void add(int value) {
				throw new UnsupportedOperationException();
			}
		});
	}

	public SuffixAutomaton(IntList s) {
		int count = s.size();
		length = new int[2 * count + 1];
		link = new int[2 * count + 1];
		first = new int[2 * count + 1];
		next = new int[4 * count];
		label = new int[4 * count];
		to = new int[4 * count];
		Arrays.fill(first, -1);
		link[0] = -1;
		size = 1;
		edgeSize = 0;
		last = 0;
		for (int i = 0; i < s.size(); i++) {
			int c = s.get(i);
			int current = size++;
			length[current] = length[last] + 1;
			for (int previous = last;; previous = link[previous]) {
				if (previous == -1) {
					link[current] = 0;
					break;
				}
				int index = findEdge(previous, c);
				if (index != -1) {
					int curLink = to[index];
					if (length[previous] + 1 == length[curLink])
						link[current] = curLink;
					else {
						int clone = size++;
						length[clone] = length[previous] + 1;
						link[clone] = link[curLink];
						int linkEdge = first[curLink];
						while (linkEdge != -1) {
							next[edgeSize] = first[clone];
							first[clone] = edgeSize;
							label[edgeSize] = label[linkEdge];
							to[edgeSize++] = to[linkEdge];
							linkEdge = next[linkEdge];
						}
						for (; previous != -1; previous = link[previous]) {
							int edge = findEdge(previous, c);
							if (edge == -1 || to[edge] != curLink)
								break;
							to[edge] = clone;
						}
						link[current] = link[curLink] = clone;
					}
					break;
				}
				next[edgeSize] = first[previous];
				first[previous] = edgeSize;
				label[edgeSize] = c;
				to[edgeSize++] = current;
			}
			last = current;
		}
	}

	public int findEdge(int vertex, int label) {
		int edge = first[vertex];
		while (edge != -1) {
			if (this.label[edge] == label)
				return edge;
			edge = next[edge];
		}
		return -1;
	}
}

class StronglyConnectedComponents {
	private final Graph graph;
	private int[] order;
	private boolean[] visited;
	private int index = 0;
	private int vertexCount;
	private int[] condensed;
	private Set<Integer> next;

	private StronglyConnectedComponents(Graph graph) {
		this.graph = graph;
		vertexCount = graph.vertexCount();
		order = new int[vertexCount];
		visited = new boolean[vertexCount];
		condensed = new int[vertexCount];
	}

	public static Pair<int[], Graph> kosaraju(Graph graph) {
		return new StronglyConnectedComponents(graph).kosaraju();
	}

	private Pair<int[], Graph> kosaraju() {
		for (int i = 0; i < vertexCount; i++) {
			if (!visited[i])
				firstDFS(i);
		}
		Arrays.fill(visited, false);
		Graph result = new Graph(0);
		index = 0;
		for (int i = vertexCount - 1; i >= 0; i--) {
			if (!visited[order[i]]) {
				next = new TreeSet<Integer>();
				secondDFS(order[i]);
				result.addVertices(1);
				for (int set : (Integer[]) next.toArray())
					result.addSimpleEdge(set, index);
				index++;
			}
		}
		return Pair.makePair(condensed, result);
	}

	private void secondDFS(int vertexID) {
		if (visited[vertexID]) {
			if (condensed[vertexID] != index)
				next.add(condensed[vertexID]);
			return;
		}
		condensed[vertexID] = index;
		visited[vertexID] = true;
		int edgeID = graph.firstInbound(vertexID);
		while (edgeID != -1) {
			secondDFS(graph.source(edgeID));
			edgeID = graph.nextInbound(edgeID);
		}
	}

	private void firstDFS(int vertexID) {
		if (visited[vertexID])
			return;
		visited[vertexID] = true;
		int edgeID = graph.firstOutbound(vertexID);
		while (edgeID != -1) {
			firstDFS(graph.destination(edgeID));
			edgeID = graph.nextOutbound(edgeID);
		}
		order[index++] = vertexID;
	}
}