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:

/**
 *
 * @author sundet
 */

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;

public class B126 {
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        String s = in.nextLine();
        
        int list1[]=new int[s.length()+1];
        int list2[]=new int[s.length()+1];
        
        int index=0;
       
        for(int i=1;i<s.length();i++) {
            while(index>0 && s.charAt(index)!=s.charAt(i)) {
                index=list1[index-1];
            }
            
            if(s.charAt(index)==s.charAt(i))index++;
            
            list1[i]=index;
            list2[index]++;
        }
        
        int length=list1[s.length()-1];
        
        if(length>0 && list2[length]<2) length=list1[length-1];
        
        if(length==0)System.out.print("Just a legend");
        else System.out.print(s.substring(0,length));
    }
}