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>
int main() {
  std::ios_base::sync_with_stdio(false);
  std::string s;
  std::cin >> s;
  int n = s.length();
  std::vector<int> prefix_fun(n, 0);
  for (int i = 1; i < n; i++) {
    int j = prefix_fun[i - 1];
    while (j > 0 && s[i] != s[j]) {
      j = prefix_fun[j - 1];
    }
    if (s[i] == s[j]) {
      j++;
    }
    prefix_fun[i] = j;
  }
  if (prefix_fun[n - 1] == 0) {
    std::cout << "Just a legend";
    return 0;
  }
  for (int i = 1; i < n - 1; i++) {
    if (prefix_fun[i] == prefix_fun[n - 1]) {
      std::cout << s.substr(0, prefix_fun[i]);
      return 0;
    }
  }
  int j = prefix_fun[prefix_fun[n - 1] - 1];
  if (j == 0) {
    std::cout << "Just a legend";
    return 0;
  }
  std::cout << s.substr(0, j);
  return 0;
}