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;
int32_t main() {
  long long t = 1, n, m;
  while (t--) {
    string s;
    cin >> s;
    n = s.length();
    vector<long long> pi(n, 0);
    for (long long i = 1; i < n; i++) {
      long long j = pi[i - 1];
      while (j > 0 && s[i] != s[j]) j = pi[j - 1];
      if (s[i] == s[j]) j++;
      pi[i] = j;
    }
    if (pi[n - 1] == 0) {
      cout << "Just a legend\n";
      continue;
    }
    long long len = 0;
    for (long long i = 0; i < n - 1; i++) {
      if (pi[i] == pi[n - 1]) {
        len = pi[n - 1];
        break;
      }
    }
    if (!len) {
      if (pi[pi[n - 1] - 1]) {
        len = pi[pi[n - 1] - 1];
      }
    }
    cout << (len ? s.substr(0, len) + "\n" : "Just a legend\n");
  }
  return 0;
}