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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.StringTokenizer;
// knuth-moris-pattrn string matching algorithm
public class Main {
    public static void main(String args[])throws Exception
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st;
        String s=br.readLine();
        int pos[]=new int[s.length()+1];
        int cnt[]=new int[s.length()+1];
        int ind=0;
        for(int i=1;i<s.length();i++)
        {
            while(ind>0 && s.charAt(ind)!=s.charAt(i))ind=pos[ind-1];
            if(s.charAt(ind)==s.charAt(i))ind++;
            pos[i]=ind;
            cnt[ind]++;
        }
        int len=pos[s.length()-1];
        if(len>0 && cnt[len]<2)len=pos[len-1];
        if(len==0)System.out.print("Just a legend");
        else System.out.print(s.substring(0,len));
    }
}