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 CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
int A[1000000];
int main() {
  string st;
  cin >> st;
  int n = st.size();
  int bordes[n];
  int i = 1, j = 0;
  bordes[0] = 0;
  while (i < n) {
    while (j > 0 && st[i] != st[j]) j = bordes[j - 1];
    if (st[i] == st[j]) j++;
    bordes[i++] = j;
    A[j] += 1;
  }
  int mayor = bordes[n - 1];
  int rpta = 0;
  if (mayor != 0) {
    if (A[mayor] > 1) {
      rpta = mayor;
    } else {
      if (bordes[mayor - 1] != 0) {
        rpta = bordes[mayor - 1];
      }
    }
  }
  if (rpta == 0)
    cout << "Just a legend" << endl;
  else {
    for (int j = 0; j < rpta; j++) {
      cout << st[j];
    }
    cout << endl;
  }
  return 0;
}