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;
const long long PR = 19260817;
vector<int> constructKMP(string pattern) {
  int n = pattern.size();
  vector<int> next(n + 1, 0);
  for (int i = 1, j = 0; i < n; i++) {
    while (j > 0 && pattern[i] != pattern[j]) j = next[j - 1];
    if (pattern[i] == pattern[j])
      next[i] = ++j;
    else
      next[i] = j;
  }
  return next;
}
int main() {
  string s;
  cin >> s;
  int n = s.size();
  vector<int> v = constructKMP(s);
  for (int i = n - 1; v[i]; i = v[i - 1]) {
    for (int j = 0; j < n - 1; j++) {
      if (v[i] == v[j]) {
        cout << s.substr(0, v[j]);
        return 0;
      }
    }
  }
  cout << "Just a legend\n";
  return 0;
}