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;
vector<int> prefix_function(string s) {
  int n = (int)s.length();
  vector<int> pi(n);
  for (int i = 1; i < n; i++) {
    int j = pi[i - 1];
    while (j > 0 && s[i] != s[j]) j = pi[j - 1];
    if (s[i] == s[j]) j++;
    pi[i] = j;
  }
  return pi;
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(NULL);
  string s;
  cin >> s;
  int f = 0;
  vector<int> v;
  v = prefix_function(s);
  if (v[s.length() - 1] == 0) {
    cout << "Just a legend";
    return 0;
  }
  for (int i = v[s.length() - 1]; i < s.length() - 1; i++) {
    if (v[i] == v[s.length() - 1]) {
      f = 1;
      break;
    }
  }
  if (f == 1) {
    for (int i = 0; i < v[s.length() - 1]; i++) cout << s[i];
    return 0;
  }
  if (v[v[s.length() - 1] - 1] > 0) {
    for (int i = 0; i < v[v[s.length() - 1] - 1]; i++) cout << s[i];
    return 0;
  }
  cout << "Just a legend";
  return 0;
}