Problem: A positive integer number n is written on a blackboard. It consists of not more than 105 digits. You have to transform it into a beautiful number by erasing some of the digits, and you want to erase as few digits as possible.

The number is called beautiful if it consists of at least one digit, doesn't have leading zeroes and is a multiple of 3. For example, 0, 99, 10110 are beautiful numbers, and 00, 03, 122 are not.

Write a program which for the given n will find a beautiful number such that n can be transformed into this number by erasing as few digits as possible. You can erase an arbitraty set of digits. For example, they don't have to go one after another in the number n.

If it's impossible to obtain a beautiful number, print -1. If there are multiple answers, print any of them.

Input

The first line of input contains n — a positive integer number without leading zeroes (1 ≤ n < 10100000).

Output

Print one number — any beautiful number obtained by erasing as few as possible digits. If there is no answer, print  - 1.

Examples

Input

1033


Output

33


Input

10


Output

0


Input

11


Output

-1

Note

In the first example it is enough to erase only the first digit to obtain a multiple of 3. But if we erase the first digit, then we obtain a number with a leading zero. So the minimum number of digits to be erased is two.

Solution (in JAVA):

Solution:
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.ObjectInputStream.GetField;
import java.io.PrintWriter;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.InputMismatchException;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.Scanner;
import java.util.Stack;
import java.util.StringTokenizer;
import java.util.TreeMap;
import java.util.TreeSet;



	public class Q1 {
		
		static long MOD = 1000000007;
		static boolean b[], b1[], check;
		static ArrayList<Integer>[] amp, pa;
		static ArrayList<Pair>[] amp1;
		static ArrayList<Pair>[][] damp;
		static int left[],s[],right[],sum[],dist[],cnt[],start[],color[],parent[],prime[],size[];
		static long ans = 0,k;
		static int p = 0;
		static FasterScanner sc = new FasterScanner(System.in);
		static Queue<Pair> queue = new LinkedList<>();
		static PriorityQueue<Integer> pq;
		static BufferedWriter log;
		static HashSet<Integer>[] hs;
		static HashMap<String,Integer> hm;
		static HashMap<Pair,Integer> hmp;
		static Stack<Integer> st;
		static boolean boo[][];
		static Pair prr[];
		static long parent1[],parent2[],size1[],size2[],arr1[],SUM[],MAX[];
		static int arr[];
		public static void main(String[] args) throws Exception {
	    	/*new Thread(null, new Runnable() {
				public void run() {
					try {
*/
						soln();
	/*				} catch (Exception e) {
						System.out.println(e);
					}
				}
			}, "1", 1 << 26).start();
		*/}
		static int dp[][];
		static int N,K;
		
		
		public static void soln() throws IOException {
			//FasterScanner in = new FasterScanner(new FileInputStream("C:\\Users\\Admin\\Desktop\\QCL.txt"));
			//PrintWriter out = new PrintWriter("C:\\Users\\Admin\\Desktop\\A1.txt");
			log = new BufferedWriter(new OutputStreamWriter(System.out));
			String str = sc.nextLine();
			int N = str.length();
			int arr[] = new int[3];
			int sum = 0;
			boolean b = false;
			StringBuilder sb = new StringBuilder();
			boolean flag = false;
			for(int i = 0;i<N;i++){
				int x = str.charAt(i)-'0';
				if(x==0){
					flag = true;
				}
				if(str.charAt(i)!='0' || b || i== N-1){
					sb.append(str.charAt(i));
					if(x!=0) arr[x%3]++;
					b = true;
				}
				sum += (x);
			}
			//System.out.println(arr[1]+" "+arr[2]);
			int n = sb.length();
			if(sum%3==0){
				log.write(sb.toString());
				log.close();
				return;
			}
			else if(sum%3==1){
				//System.out.println(n);
				int c = -1, d = -1;
				StringBuilder sb1 = new StringBuilder();
				StringBuilder sb2 = new StringBuilder();
				if(arr[1]>0){
					c = 0;
					for(int i = n-1;i>=0;i--){
						if(c>=1 || (sb.charAt(i)-'0')%3!=1){
							sb1.append(sb.charAt(i));
						}
						if((sb.charAt(i)-'0')%3==1){
							c++;
						}
					}
					sb1 = sb1.reverse();
				//	System.out.println(sb1);
					while(sb1.length()>0 && sb1.charAt(0)=='0') sb1.deleteCharAt(0);
				}
				if(arr[2]>1){
					d = 0;
					for(int i = n-1;i>=0;i--){
						if(d>=2 || (sb.charAt(i)-'0')%3!=2){
							sb2.append(sb.charAt(i));
						}
						if((sb.charAt(i)-'0')%3==2){
							d++;
						}
					}
					sb2 = sb2.reverse();
					while(sb2.length()>0 && sb2.charAt(0)=='0') sb2.deleteCharAt(0);
					//System.out.println(sb2+"*");
				}
				//System.out.println(sb1+" "+sb2);
				if((c==-1 &&d==-1)) System.out.println(-1);
				else if(sb1.length() == 0 && sb2.length()==0){
					if(flag) System.out.println(0);
					else System.out.println(-1);
				}
				else if(sb1.length()>=sb2.length()){
					System.out.println(sb1);
				}
				else System.out.println(sb2);
			}
			else{
				int c = -1, d = -1;
				StringBuilder sb1 = new StringBuilder();
				StringBuilder sb2 = new StringBuilder();
				if(arr[2]>0){
					c = 0;
					for(int i = n-1;i>=0;i--){
						if(c>=1 || (sb.charAt(i)-'0')%3!=2){
							sb1.append(sb.charAt(i));
						}
						if((sb.charAt(i)-'0')%3==2){
							c++;
						}
					}
					sb1 = sb1.reverse();
					while(sb1.length()>0 && sb1.charAt(0)=='0') sb1.deleteCharAt(0);
				}
				if(arr[1]>1){
					d = 0;
					for(int i = n-1;i>=0;i--){
						if(d>=2 || (sb.charAt(i)-'0')%3!=1){
							sb2.append(sb.charAt(i));
						}
						if((sb.charAt(i)-'0')%3==1){
							d++;
						}
					}
					sb2 = sb2.reverse();
					while(sb2.length()>0 && sb2.charAt(0)=='0') sb2.deleteCharAt(0);
				}
				//System.out.println(sb1+" "+sb2);
				if((c==-1 &&d==-1)) System.out.println(-1);
				else if(sb1.length() == 0 && sb2.length()==0){
					if(flag) System.out.println(0);
					else System.out.println(-1);
				}
				else if(sb1.length()>=sb2.length()){
					System.out.println(sb1);
				}
				else System.out.println(sb2);
			}
			log.close();
			//out.close();
		}
		static long comp(long n, long m){
			int l = Math.max(Long.toBinaryString(n).length(),Long.toBinaryString(m).length());
			System.out.println((m&(n^MAX[l]))+" "+(((m^MAX[l])&n)));
			return 2*((m&(n^MAX[l]))+(((m^MAX[l])&n)));
		}
		static void dfs2D(Pair p1){
			int i = p1.u, j = p1.v;
			boo[i][j] = true;
			amp1[p].add(p1);
			for(Pair pair : damp[i][j]){
				if(!boo[pair.u][pair.v]){
					dfs2D(pair);
				}
			}
		}
		static void recur(String str, int i, int n) throws IOException{
			//System.out.println(str+" "+i+" "+n);
			String s = str+(char)(i+'a')+"";
			if(n==N){
				log.write(s+"\n");
				return;
			}
			if(b[i]){
				for(int j = 0;j<26;j++){
					//System.out.println(1);
					if(!b[j] && j!=('y'-'a')){
						//System.out.println(1);
						recur(s,j,n+1); 
					}
				}
			}
			else{
				for(int j = 0;j<26;j++){
					if(b[j]){
					//	System.out.println(2);
						recur(s,j,n+1); 
					}
				}
			}
		}
		static void dfs(int x){
			long sum = 0, max = Long.MIN_VALUE;
			b[x] = true;
			//System.out.println(amp[x].size());
			PriorityQueue<Long> pq=new PriorityQueue<>(10,Collections.reverseOrder());
			if(amp[x].size()>2) check = true;
			for(int i:amp[x]){
				if(!b[i]){
					parent[i] = x;
					dfs(i);
					sum+=SUM[i];
					max = Math.max(max, MAX[i]);
					pq.add(MAX[i]);
				}
			}
			SUM[x] = sum+arr[x];
			MAX[x] = Math.max(SUM[x],max);
			if(pq.size()>=2){
				ans = Math.max(ans, pq.poll()+pq.poll());
			}
			
		}
		public static void buildWeightedGraph(int n){
			for(int i =0 ;i< n; i++){
				int x = sc.nextInt(), y = sc.nextInt(), w = sc.nextInt();
				amp1[--x].add(new Pair(--y,w));
				amp1[y].add(new Pair(x,w));
			}
		}
		
		public static void seive(int n){
			b = new boolean[(n+1)];
			Arrays.fill(b, true);
			b[1] = false;
			for(int i = 2;i*i<=n;i++){
				if(b[i]){
					for(int p = 2*i;p<=n;p+=i){
						b[p] = false;
						prime[p] = i;
					}
				}
			}
			for(int i = 2;i<=n;i++){
				if(b[i]) prime[i] = i;
			}
		}
		
		static class Graph{
			int vertex;
			int weight;
			Graph(int v, int w){
				vertex = v;
				weight = w;
			}
		}
		static class Pair implements Comparable<Pair> {
			int u;
			int v;
			public Pair(int u, int v) {
				this.u = u;
				this.v = v;
			}
			
			public int hashCode() {
				int hu = (int) (u ^ (u >>> 32));
				int hv = (int) (v ^ (v >>> 32));
				return 31*hu + hv;
			}
	 
			public boolean equals(Object o) {
				Pair other = (Pair) o;
				return ((u == other.u && v == other.v));
			}
	 
			public int compareTo(Pair other) {
				return Long.compare(u, other.u)!= 0 ? (Long.compare(u, other.u)) : (Long.compare(v, other.v));
			}

			public String toString() {
				return "[u=" + u + ", v=" + v + "]";
			}
		}
		
		public static void buildGraph(int n){
			for(int i =0;i<n;i++){
				int x = sc.nextInt()-1, y = sc.nextInt()-1;
				amp[x].add(y);
				amp[y].add(x);
			}
		}
		
		
		public static int getParent(long x){
			while(parent[(int) x]!=x){
				parent[ (int) x] = parent[(int) parent[ (int) x]];
				x = parent[ (int) x];
			}
			return (int) x;
		}
		static long min(long a, long b, long c){
			if(a<b && a<c) return a;
			if(b<c) return b;
			return c;
		}
		/*
		
		static class Pair3{
			int x, y ,z;
			Pair3(int x, int y, int z){
				this.x = x;
				this.y = y;
				this.z = z;
			}
		}*/
		static int sum(int n){
			String str = Integer.toString(n);
			int cnt = 0;
			for(int i = 0; i< str.length();i++){
				cnt+=(str.charAt(i)-'0');
			}
			return cnt;
		}
		 static void KMPSearch(String pat, String txt)
		    {
		        int M = pat.length();
		        int N = txt.length();
		 
		        // create lps[] that will hold the longest
		        // prefix suffix values for pattern
		        int lps[] = new int[M];
		        int j = 0;  // index for pat[]
		 
		        // Preprocess the pattern (calculate lps[]
		        // array)
		        computeLPSArray(pat,M,lps);
		 
		        int i = 0;  // index for txt[]
		        while (i < N)
		        {
		            if (pat.charAt(j) == txt.charAt(i))
		            {
		                j++;
		                i++;
		            }
		            if (j == M)
		            {
		               // parent.add((i-j));
		                j = lps[j-1];
		            }
		 
		            // mismatch after j matches
		            else if (i < N && pat.charAt(j) != txt.charAt(i))
		            {
		                // Do not match lps[0..lps[j-1]] characters,
		                // they will match anyway
		                if (j != 0)
		                    j = lps[j-1];
		                else
		                    i = i+1;
		            }
		        }
		    }
		 static void computeLPSArray(String pat, int M, int lps[])
		    {
		        // length of the previous longest prefix suffix
		        int len = 0;
		        int i = 1;
		        lps[0] = 0;  // lps[0] is always 0
		 
		        // the loop calculates lps[i] for i = 1 to M-1
		        while (i < M)
		        {
		            if (pat.charAt(i) == pat.charAt(len))
		            {
		                len++;
		                lps[i] = len;
		                i++;
		            }
		            else  // (pat[i] != pat[len])
		            {
		                // This is tricky. Consider the example.
		                // AAACAAAA and i = 7. The idea is similar 
		                // to search step.
		                if (len != 0)
		                {
		                    len = lps[len-1];
		 
		                    // Also, note that we do not increment
		                    // i here
		                }
		                else  // if (len == 0)
		                {
		                    lps[i] = len;
		                    i++;
		                }
		            }
		        }
		    }
		private static void permutation(String prefix, String str) {
		    int n = str.length();
		    if (n == 0); //hs.add(prefix);
		    else {
		        for (int i = 0; i < n; i++)
		            permutation(prefix + str.charAt(i), str.substring(0, i) + str.substring(i+1, n));
		    }
		}
		public static char give(char c1,char c2){
			if(c1!='a' && c2!='a') return 'a';
			if(c1!='b' && c2!='b') return 'b';
			return 'c';
		}
		
		public static void buildTree(int n){
			int arr[] = sc.nextIntArray(n);
			for(int i = 0;i<n;i++){
				int x = arr[i]-1;
				amp[i+1].add(x);
				amp[x].add(i+1);
			}
		}
		
		static class SegmentTree {
			boolean st[];
			boolean lazy[];

			SegmentTree(int n) {
				int size = 4 * n;
				st = new boolean[size];
				Arrays.fill(st, true);
				lazy = new boolean[size];
				Arrays.fill(lazy, true);
				//build(0, n - 1, 1);
			}
			
			/*long[] build(int ss, int se, int si) {
				if (ss == se) {
					st[si][0] = 1;
					st[si][1] = 1;
					st[si][2] = 1;
					return st[si];
				}
				int mid = (ss + se) / 2;
				long a1[] = build(ss, mid, si * 2), a2[] = build(mid + 1, se,
						si * 2 + 1);
				long ans[] = new long[3];
				if (arr[mid] < arr[mid + 1]) {
					ans[1] = Math.max(a2[1], Math.max(a1[1], a1[2] + a2[0]));
					if (a1[1] == (mid - ss + 1))
						ans[0] = ans[1];
					else
						ans[0] = a1[0];
					if (a2[2] == (se - mid))
						ans[2] = ans[1];
					else
						ans[2] = a2[2];
				} else {
					ans[1] = Math.max(a1[1], a2[1]);
					ans[0] = a1[0];
					ans[2] = a2[2];
				}
				st[si] = ans;
				return st[si];
			}*/

			void update(int si, int ss, int se, int idx, long x) {
				if (ss == se) {
					//arr[idx] += val;
					st[si]=false;
				} 
				else {
					int mid = (ss + se) / 2;
					if(ss <= idx && idx <= mid)
			        {
			             update(2*si, ss, mid, idx, x);
			        }
			        else
			        { update(2*si+1, mid+1, se, idx, x);
			        }
					st[si] = st[2*si]|st[2*si+1];
				}
			}
			/*boolean get(int qs, int qe, int ss, int se, int si){
				if(qs>se || qe<ss) return 0;
				if (qs <= ss && qe >= se) {
					return st[si];
				}
				int mid = (ss+se)/2;
				return get(qs, qe, ss, mid, si * 2)+get(qs, qe, mid + 1, se, si * 2 + 1);
			}*/
			void updateRange(int node, int start, int end, int l, int r, boolean val)
			{
			    if(!lazy[node])
			    { 
			        // This node needs to be updated
			        st[node] = lazy[node];    // Update it
			        if(start != end)
			        {
			            lazy[node*2] = lazy[node];                  // Mark child as lazy
			            lazy[node*2+1] = lazy[node];                // Mark child as lazy
			        }
			        lazy[node] = true;                                  // Reset it
			    }
			    if(start > end || start > r || end < l)              // Current segment is not within range [l, r]
			        return;
			    if(start >= l && end <= r)
			    {
			        // Segment is fully within range
			        st[node] =  val;
			        if(start != end)
			        {
			            // Not leaf node
			            lazy[node*2] = val;
			            lazy[node*2+1] = val;
			        }
			        return;
			    }
			    int mid = (start + end) / 2;
			    updateRange(node*2, start, mid, l, r, val);        // Updating left child
			    updateRange(node*2 + 1, mid + 1, end, l, r, val);   // Updating right child
			    st[node] = st[node*2] | st[node*2+1];        // Updating root with max value 
			}

			boolean queryRange(int node, int start, int end, int l, int r)
			{
			    if(start > end || start > r || end < l)
			        return false;         // Out of range
			    if(!lazy[node])
			    {
			        // This node needs to be updated
			        st[node] = lazy[node];            // Update it
			        if(start != end)
			        {
			            lazy[node*2] = lazy[node];         // Mark child as lazy
			            lazy[node*2+1] = lazy[node];    // Mark child as lazy
			        }
			        lazy[node] = true;                 // Reset it
			    }
			    if(start >= l && end <= r)             // Current segment is totally within range [l, r]
			        return  st[node];
			    int mid = (start + end) / 2;
			    boolean p1 = queryRange(node*2, start, mid, l, r);         // Query left child
			    boolean b = queryRange(node*2 + 1, mid + 1, end, l, r); // Query right child
			    return (p1 | b);
			}
			void print() {
				for (int i = 0; i < st.length; i++) {
					System.out.print(st[i]+" ");
				}
				System.out.println();
			}
		}
		static int convert(int x){
			int cnt = 0;
			String str = Integer.toBinaryString(x);
			//System.out.println(str);
			for(int i = 0;i<str.length();i++){
				if(str.charAt(i)=='1'){
					cnt++;
				}
			}
			int ans = (int) Math.pow(3, 6-cnt);
			return ans;
		}
		static class Node2{
			Node2 left = null;
			Node2 right = null;
			Node2 parent = null;
			int data;
		}
		static class BinarySearchTree{
			Node2 root = null;
			int height = 0;
			int max = 0;
			int cnt = 1;
			ArrayList<Integer> parent = new ArrayList<>();
			HashMap<Integer, Integer> hm = new HashMap<>();
			public void insert(int x){
				Node2 n = new Node2();
				n.data = x;
				if(root==null){
					root = n;
				}
				else{
					Node2 temp = root,temb = null;
					while(temp!=null){
						temb = temp;
						if(x>temp.data) temp = temp.right;
						else temp = temp.left;
					}
					if(x>temb.data) temb.right = n;
					else temb.left = n;
					n.parent = temb;
					parent.add(temb.data);
				}
			}
			public Node2 getSomething(int x, int y, Node2 n){
				if(n.data==x || n.data==y) return n;
				else if(n.data>x && n.data<y) return n;
				else if(n.data<x && n.data<y) return getSomething(x,y,n.right);
				else return getSomething(x,y,n.left);
			}
			public Node2 search(int x,Node2 n){
				if(x==n.data){
					max = Math.max(max, n.data);
					return n;
				}
				if(x>n.data){
					max = Math.max(max, n.data);
					return search(x,n.right);
				}
				else{
					max = Math.max(max, n.data);
					return search(x,n.left);
				}
			}
			public int getHeight(Node2 n){
				if(n==null) return 0;
				height = 1+ Math.max(getHeight(n.left), getHeight(n.right));
				return height;
			}
		}
		static long findDiff(long[] arr, long[] brr, int m){
			int i = 0, j = 0;
			long fa = 1000000000000L;
			while(i<m && j<m){
				long x = arr[i]-brr[j];
				if(x>=0){
					if(x<fa) fa = x;
					j++;
				}
				else{
					if((-x)<fa) fa = -x;
					i++;
				}
			}
			return fa;
		}
		public static long max(long x, long y, long z){
			if(x>=y && x>=z) return x;
			if(y>=x && y>=z) return y;
			return z;
		}
		
		static long modInverse(long a, long mOD2){
		            return  power(a, mOD2-2, mOD2);
		}
		static long power(long x, long y, long m)
		{
		    if (y == 0)
		        return 1;
		    long p = power(x, y/2, m) % m;
		    p = (p * p) % m;
		 
		    return (y%2 == 0)? p : (x * p) % m;
		}
		static long power2(long x,BigInteger y,long m){
			long ans = 1;
			BigInteger two = new BigInteger("2");
			while(y.compareTo(BigInteger.ZERO)>0){
				if(y.getLowestSetBit()==y.bitCount()){
					x = (x*x)%MOD;
					y = y.divide(two);
				}
				else{
					ans = (ans*x)%MOD;
					y = y.subtract(BigInteger.ONE);
				}
			}
			return ans;
		}
		static BigInteger power2(BigInteger x, BigInteger y, BigInteger m){
			BigInteger ans = new BigInteger("1");
			BigInteger one  = new BigInteger("1");
			BigInteger two  = new BigInteger("2");
			BigInteger zero  = new BigInteger("0");
			while(y.compareTo(zero)>0){
				//System.out.println(y);
				if(y.mod(two).equals(one)){
					ans = ans.multiply(x).mod(m);
					y = y.subtract(one);
				}
				else{
					x = x.multiply(x).mod(m);
					y = y.divide(two);
				}
			}
			return ans;
		}
		static BigInteger power(BigInteger x, BigInteger y, BigInteger m)
		{
		    if (y.equals(0))
		        return (new BigInteger("1"));
		    BigInteger p = power(x, y.divide(new BigInteger("2")), m).mod(m);
		    p = (p.multiply(p)).mod(m);
		 
		    return (y.mod(new BigInteger("2")).equals(0))? p : (p.multiply(x)).mod(m);
		}
		static long d,x,y;
		public static void extendedEuclidian(long a, long b){
			if(b == 0) {
		        d = a;
		        x = 1;
		        y = 0;
		    }
		    else {
		        extendedEuclidian(b, a%b);
		        int temp = (int) x;
		        x = y;
		        y = temp - (a/b)*y;
		    }
		}
		
		public static long gcd(long n, long m){
			if(m!=0) return gcd(m,n%m);
			else return n;
		}
		
		static BufferedReader reader;
	    static StringTokenizer tokenizer;
	    static PrintWriter writer;
	
	
	   
	    static class FasterScanner {

			private final InputStream stream;
			private final byte[] buf = new byte[8192];
			private int curChar, snumChars;
			private SpaceCharFilter filter;

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

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

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

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

			public int[] nextIntArray(int n) {
				int a[] = new int[n];
				for (int i = 0; i < n; i++) {
					a[i] = nextInt();
				}
				return a;
			}

			public long[] nextLongArray(int n) {
				long a[] = new long[n];
				for (int i = 0; i < n; i++) {
					a[i] = nextInt();
				}
				return a;
			}
	                
			public String readString() {
				int c = snext();
				while (isSpaceChar(c)) {
					c = snext();
				}
				StringBuilder res = new StringBuilder();
				do {
					res.appendCodePoint(c);
					c = snext();
				} while (!isSpaceChar(c));
				return res.toString();
			}

			public String nextLine() {
				int c = snext();
				while (isSpaceChar(c))
					c = snext();
				StringBuilder res = new StringBuilder();
				do {
					res.appendCodePoint(c);
					c = snext();
				} while (!isEndOfLine(c));
				return res.toString();
			}

			public boolean isSpaceChar(int c) {
				if (filter != null)
					return filter.isSpaceChar(c);
				return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
			}

			private boolean isEndOfLine(int c) {
				return c == '\n' || c == '\r' || c == -1;
			}

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