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;
string s;
int cnt[3000000];
vector<int> p_fun(string s) {
  int n = s.length();
  vector<int> pi(n);
  for (int i = 1; i < n; ++i) {
    int j = pi[i - 1];
    while (s[i] != s[j] && j > 0) j = pi[j - 1];
    if (s[i] == s[j]) j++;
    pi[i] = j++;
    cnt[j]++;
  }
  return pi;
}
int main() {
  cin >> s;
  vector<int> pi = p_fun(s);
  int n = s.length() - 1;
  int len = pi[n];
  if (len == 0) {
    cout << "Just a legend";
    return 0;
  }
  for (int i = 0; i < n - 1; ++i)
    if (pi[i] == len) {
      cout << s.substr(0, len);
      return 0;
    }
  len = pi[len - 1];
  if (len == 0) {
    cout << "Just a legend";
    return 0;
  }
  cout << s.substr(0, len);
  return 0;
}