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.*;
public class b124 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String str = in.next();
        ArrayList<Integer> list = new ArrayList();
        list.add(0);
        int length = str.length();
        for (int i = 1, j = 0; i < length; i++) {
            while (j > 0 && str.charAt(j) != str.charAt(i))
                j = list.get(j - 1);
 
            if (str.charAt(j) == str.charAt(i))
                list.add(i, ++j);
            else 
                list.add(i, j);
        }
 
        boolean exist = false;
        int len;
 
        len = list.get(str.length() - 1);
 
        if(len!=0){
            for(int i=0;i<2;i++) {
                for (int j = 1; j < str.length() - 1; j++) {
                    if (len == list.get(j)) {
                        exist = true;
                        break;
                    }
     
                }
                if(!exist){
                len=list.get(len-1);
                    if(len==0)
                        break;
                }
                else break;
            }
        }
        if (!exist || len == 0) {
            System.out.println("Just a legend");
        } else {
            System.out.println(str.substring(0, len));
        }
 
    }
}