Problem: Once Bob saw a string. It contained so many different letters, that the letters were marked by numbers, but at the same time each letter could be met in the string at most 10 times. Bob didn't like that string, because it contained repeats: a repeat of length x is such a substring of length 2x, that its first half coincides character by character with its second half. Bob started deleting all the repeats from the string. He does it as follows: while it's possible, Bob takes the shortest repeat, if it is not unique, he takes the leftmost one, and deletes its left half and everything that is to the left of this repeat.

You're given the string seen by Bob. Find out, what it will look like after Bob deletes all the repeats in the way described above.

Input

The first input line contains integer n (1 ≤ n ≤ 105) — length of the string. The following line contains n space-separated integer numbers from 0 to 109 inclusive — numbers that stand for the letters of the string. It's guaranteed that each letter can be met in the string at most 10 times.

Output

In the first line output the length of the string's part, left after Bob's deletions. In the second line output all the letters (separated by a space) of the string, left after Bob deleted all the repeats in the described way.

Examples

Input

6
1 2 3 1 2 3


Output

3
1 2 3 


Input

7
4 5 6 5 6 7 7


Output

1
7 

Solution (in JAVA):

Solution:
import java.util.HashMap;
import java.io.BufferedReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Random;
import java.io.Writer;
import java.util.List;
import java.util.Map;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.ArrayList;
import java.io.Reader;
import java.math.BigInteger;
import java.util.Collections;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 * @author niyaznigmatul 
 */
public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		FastScanner in = new FastScanner(inputStream);
		FastPrinter out = new FastPrinter(outputStream);
		TaskC solver = new TaskC();
		solver.solve(1, in, out);
		out.close();
	}
}

class TaskC {
	public void solve(int testNumber, FastScanner in, FastPrinter out) {
        int n = in.nextInt();
        int[] a = new int[n];
        Map<Integer, Integer> last = new HashMap<Integer, Integer>();
        for (int i = 0; i < n; i++) {
            a[i] = in.nextInt();
        }
        int[] prev = new int[n];
        Arrays.fill(prev, -1);
        for (int i = n - 1; i >= 0; i--) {
            Integer z = last.get(a[i]);
            if (z != null) {
                prev[z] = i;
            }
            last.put(a[i], i);
        }
        Hash h = new Hash(a);
        List<Segment>[] b = new List[n];
        for (int i = 0; i < n; i++) {
            b[i] = new ArrayList<Segment>(1);
        }
        for (int i = n - 1; i >= 0; i--) {
            for (int j = prev[i]; j >= 0; j = prev[j]) {
                b[i - j].add(new Segment(j, i));
            }
        }
        int removed = 0;
        for (int i = 0; i < n; i++) {
            Collections.sort(b[i]);
        }
        for (int i = 0; i < n; i++) {
            for (Segment e : b[i]) {
                int left = e.a * 2 - e.b + 1;
                if (left < removed ||
                        h.get1(left, e.a + 1) != h.get1(e.a + 1, e.b + 1)
                        || h.get2(left, e.a + 1) != h.get2(e.a + 1, e.b + 1)) {
                    continue;
                }
                removed = e.a + 1;
            }
        }
        out.println(n - removed);
        out.printArray(Arrays.copyOfRange(a, removed, n));
	}

    static class Segment implements Comparable<Segment> {
        int a;
        int b;

        Segment(int a, int b) {
            this.a = a;
            this.b = b;
        }

        public int compareTo(Segment o) {
            return a - o.a;
        }
    }

    static final Random rand = new Random(234734L);
    static class Hash {
        static final int P1 = BigInteger.probablePrime(23, rand).intValue();
        static final int P2 = BigInteger.probablePrime(22, rand).intValue();
        static final int MOD1 = BigInteger.probablePrime(30, rand).intValue();
        static final int MOD2 = BigInteger.probablePrime(30, rand).intValue();
        static int[] POW1;
        static int[] POW2;
        static final int MAXN = 300000;
        static {
            POW1 = new int[MAXN];
            POW2 = new int[MAXN];
            POW1[0] = 1;
            POW2[0] = 1;
            for (int i = 1; i < MAXN; i++) {
                POW1[i] = (int) ((long) POW1[i - 1] * P1 % MOD1);
                POW2[i] = (int) ((long) POW2[i - 1] * P2 % MOD2);
            }
        }
        int[] a;
        int[] hash1;
        int[] hash2;

        Hash(int[] a) {
            this.a = a;
            int n = a.length;
            hash1 = new int[n];
            hash2 = new int[n];
            long h = 0;
            for (int i = 0; i < n; i++) {
                h = (h * P1 + a[i]) % MOD1;
                hash1[i] = (int) h;
            }
            h = 0;
            for (int i = 0; i < n; i++) {
                h = (h * P2 + a[i]) % MOD2;
                hash2[i] = (int) h;
            }
        }

        int get1(int left, int right) {
            long ret = hash1[right - 1];
            if (left > 0) {
                ret -= (long) hash1[left - 1] * POW1[right - left] % MOD1;
                if (ret < 0) {
                    ret += MOD1;
                }
            }
            return (int) ret;
        }

        int get2(int left, int right) {
            long ret = hash2[right - 1];
            if (left > 0) {
                ret -= (long) hash2[left - 1] * POW2[right - left] % MOD2;
                if (ret < 0) {
                    ret += MOD2;
                }
            }
            return (int) ret;
        }
    }
}

class FastScanner extends BufferedReader {

    boolean isEOF;

    public FastScanner(InputStream is) {
        super(new InputStreamReader(is));
    }

    public int read() {
        try {
            int ret = super.read();
            if (isEOF && ret < 0) {
                throw new InputMismatchException();
            }
            isEOF = ret == -1;
            return ret;
        } catch (IOException e) {
            throw new InputMismatchException();
        }
    }

    static boolean isWhiteSpace(int c) {
        return c >= -1 && c <= 32;
    }

    public int nextInt() {
        int c = read();
        while (isWhiteSpace(c)) {
            c = read();
        }
        int sgn = 1;
        if (c == '-') {
            sgn = -1;
            c = read();
        }
        int ret = 0;
        while (!isWhiteSpace(c)) {
            if (c < '0' || c > '9') {
                throw new NumberFormatException("digit expected " + (char) c
                        + " found");
            }
            ret = ret * 10 + c - '0';
            c = read();
        }
        return ret * sgn;
    }

    }

class FastPrinter extends PrintWriter {

    public FastPrinter(OutputStream out) {
        super(out);
    }

    public FastPrinter(Writer out) {
        super(out);
    }

    public void printArray(int[] a) {
        for (int i = 0; i < a.length; i++) {
            if (i > 0) {
                print(' ');
            }
            print(a[i]);
        }
        println();
    }


}