Problem: Asterix, Obelix and their temporary buddies Suffix and Prefix has finally found the Harmony temple. However, its doors were firmly locked and even Obelix had no luck opening them.

A little later they found a string s, carved on a rock below the temple's gates. Asterix supposed that that's the password that opens the temple and read the string aloud. However, nothing happened. Then Asterix supposed that a password is some substring t of the string s.

Prefix supposed that the substring t is the beginning of the string s; Suffix supposed that the substring t should be the end of the string s; and Obelix supposed that t should be located somewhere inside the string s, that is, t is neither its beginning, nor its end.

Asterix chose the substring t so as to please all his companions. Besides, from all acceptable variants Asterix chose the longest one (as Asterix loves long strings). When Asterix read the substring t aloud, the temple doors opened. 

You know the string s. Find the substring t or determine that such substring does not exist and all that's been written above is just a nice legend.

Input

You are given the string s whose length can vary from 1 to 106 (inclusive), consisting of small Latin letters.

Output

Print the string t. If a suitable t string does not exist, then print "Just a legend" without the quotes.

Examples

Input

fixprefixsuffix


Output

fix

Input

abcdabc


Output

Just a legend

Solution (in JAVA):

Solution:

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.Arrays;
import java.util.InputMismatchException;

/**
 *
 * @author jigsaw
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        InputStream inputstream = System.in;
        OutputStream outputstream = System.out;
        InputReader in = new InputReader(inputstream);
        OutputWriter outt = new OutputWriter(outputstream);
        String S = in.readString();
        int n = S.length();
        int arr[] = new int[n];
        arr[0] = 0;
        for(int i=1;i<n;i++){
            int l = arr[i-1];
            while(l>0&&S.charAt(i)!=S.charAt(l)){
                //System.out.println("here "+i);
                l = arr[l-1];
            }
            if(S.charAt(i)==S.charAt(l)){
                l++;
                arr[i] = l;
            }
            
        }
    //    for(int x:arr)
      //      System.out.print(x+" ");
        //System.out.println(arr[n-1]);
        if(n<3)
            outt.printLine("Just a legend");
        else if(arr[n-1]==n-1)
            outt.printLine(S.substring(2));
        else{
            int x = arr[n-1];
            boolean f = false;
            while(x>0){
                //System.out.println("x = "+x);
                if(isthere(S.substring(0,x), S.substring(1,n-1))){
                    f = true;
                    break;
                }
                //System.out.println(arr[n-x]);
                Arrays.fill(arr, 0);
                for(int i=n-x+1;i<n;i++){
                    int l = arr[i-1];
                    while(l>0&&S.charAt(i)!=S.charAt(l)){
                        l = arr[l-1];
                    }
                    if(S.charAt(i)==S.charAt(l)){
                        l++;
                        arr[i] = l;
                    }
                }
                x = arr[n-1];
            }
            if(!f)
                outt.printLine("Just a legend");
            else
                outt.printLine(S.subSequence(0, x));
        }
        outt.close();
    }
    static boolean isthere(String pat,String text){
        int arr[] = LPS(pat);
        int n = text.length();
        int i = 0,j = 0;
        while(i<n){
            while(j>0&&pat.charAt(j)!=text.charAt(i)){
              //  System.out.println("here");
                j = arr[j-1];
            }
            if(pat.charAt(j)==text.charAt(i)){
                i++;
                j++;
            }
            else{
                i++;
            }
            if(j==pat.length())
                return true;
            
        }
        return false;
    }
    static int[] LPS(String S){
        int n = S.length();
        int arr[] = new int[n];
        for(int i=1;i<n;i++){
            int l = arr[i-1];
            while(l>0&&S.charAt(i)!=S.charAt(l)){
                //System.out.println("bhai");
                l = arr[l-1];
            }
            if(S.charAt(i)==S.charAt(l)){
                l++;
                arr[i] = l;
            }
            
        }
        return arr;
    }
}
class InputReader {
 
    private InputStream stream;
    private byte[] buf = new byte[1024];
    private int curChar;
    private int numChars;
    private InputReader.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 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 String readString() {
        int c = read();
        while (isSpaceChar(c))
            c = read();
        StringBuffer res = new StringBuffer();
        do {
            res.appendCodePoint(c);
            c = read();
        } while (!isSpaceChar(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;
    }
 
    public String next() {
        return readString();
    }
 
    public interface SpaceCharFilter {
        public boolean isSpaceChar(int ch);
    }
}
 
class OutputWriter {
    private final PrintWriter writer;
 
    public OutputWriter(OutputStream outputStream) {
        writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
    }
 
    public OutputWriter(Writer writer) {
        this.writer = new PrintWriter(writer);
    }
 
    public void print(Object...objects) {
        for (int i = 0; i < objects.length; i++) {
            if (i != 0)
                writer.print(' ');
            writer.print(objects[i]);
        }
    }
 
    public void printLine(Object...objects) {
        print(objects);
        writer.println();
    }
 
    public void close() {
        writer.close();
    }}