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 pi[1000005], n, mx, k;
char sir[1000005];
int main() {
  cin >> (sir + 1);
  n = strlen(sir + 1);
  pi[1] = 0;
  for (int i = 2; i <= n; ++i) {
    while (k > 0 && sir[i] != sir[k + 1]) {
      k = pi[k];
    }
    if (sir[i] == sir[k + 1]) ++k;
    pi[i] = k;
    if (i < n) mx = max(mx, pi[i]);
  }
  if (pi[n] > mx) {
    pi[n] = pi[pi[n]];
  }
  if (pi[n] < mx) {
    mx = pi[n];
  }
  if (mx < 1) {
    cout << "Just a legend";
    return 0;
  }
  for (int i = 1; i <= mx; ++i) {
    cout << sir[i];
  }
  return 0;
}