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(string s) {
  vector<int> p(s.size());
  for (size_t i = 1; i < s.size(); i++) {
    int j = p[i - 1];
    while (j > 0 && s[j] != s[i]) j = p[j - 1];
    p[i] = s[j] != s[i] ? 0 : j + 1;
  }
  return p;
}
int main() {
  string s;
  cin >> s;
  vector<int> p = prefix(s);
  int l = p[p.size() - 1];
  if (l == 0)
    cout << "Just a legend";
  else {
    while (true) {
      bool found = false;
      for (int i = p.size() - 2; i > 0; i--)
        if (p[i] == l) {
          found = true;
          break;
        }
      if (found) {
        cout << s.substr(0, l);
        break;
      } else {
        l = p[l - 1];
        if (l == 0) {
          cout << "Just a legend";
          break;
        }
      }
    }
  }
}