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;
void solve() {
  string s;
  cin >> s;
  long long n = s.size();
  vector<long long> p(n + 1), used(n + 1);
  for (int i = 1; i < n; ++i) {
    long long j = p[i - 1];
    while (j > 0 && s[i] != s[j]) {
      j = p[j - 1];
    }
    if (s[i] == s[j]) {
      j++;
    }
    p[i] = j;
    if (i < n - 1) {
      used[p[i]] = true;
    }
  }
  n--;
  while (n > 0 && p[n] != 0) {
    if (used[p[n]]) {
      cout << s.substr(0, p[n]);
      return;
    }
    n = p[n - 1];
  }
  cout << "Just a legend\n";
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  long long t = 1;
  while (t--) solve();
  return 0;
}