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.ArrayList;
import java.util.HashMap;
import java.util.Scanner;

public class Password {

    private static ArrayList<Integer> listSlice = new ArrayList<>();

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String initialWord = input.next();

        int checker = -1;

        listSlice.add(checker);

        for (int i = 0; i < initialWord.length(); i++) {
            while (checker != -1 && initialWord.charAt(i) != initialWord.charAt(checker)) {
                checker = listSlice.get(checker);
            }
            checker++;
            listSlice.add(checker);
        }

        int selected_value = listSlice.get(listSlice.size() - 1);

        int count = 0;

        for (int i = 0; i < listSlice.size(); i++) {
            if (listSlice.get(i) == selected_value) {
                count++;
            }
        }

        if (count < 2) {
            selected_value = listSlice.get(selected_value);
        }

        if (selected_value > 0) {
            System.out.println(initialWord.substring(0, selected_value));
        } else {
            System.out.println("Just a legend");
        }

        input.close();
    }
}