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.util.Arrays;
import java.util.Scanner;
 
public class Main {
    public static void nextOpe(char[]str){
        int[] next = new int[str.length];
        next[0] = -1;
        next[1] = 0;
        int i = 2;
        int cn = 0;
        while (i < str.length) {
            if(str[i-1] == str[cn]){
                next[i++] = ++cn;
            } else if (cn > 0) {
                cn = next[cn];
            } else {
                next[i++] = 0;
            }
        }
        int[] vis = new int[str.length];
        next[0] = 0;
        for(int h = 0; h < str.length-1; h++){
            vis[next[h]] = 1;
        }
        i = str.length - 1;
        boolean flag = false;
        while(next[i] != 0){
            if(vis[next[i]] == 1){
                System.out.println(Arrays.copyOfRange(str,0,next[i]));
                flag = true;
                break;
            }
            i = next[i];
        }
        if(!flag)
            System.out.println("Just a legend");
    }
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String str = sc.next();
        str += "#";
        nextOpe(str.toCharArray());
    }
}