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 compute(string &s, vector<long long> &lps, long long n) {
  long long len = 0, i = 1;
  lps[0] = 0;
  while (i < n) {
    if (s[i] == s[len]) {
      lps[i++] = ++len;
    } else {
      if (len != 0)
        len = lps[len - 1];
      else {
        lps[i++] = 0;
      }
    }
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  string s;
  cin >> s;
  long long n = s.size();
  vector<long long> lps(n);
  compute(s, lps, n);
  if (lps[n - 1] == 0) {
    cout << "Just a legend";
    return 0;
  }
  for (int i = 0; i < n - 1; i++) {
    if (lps[i] == lps[n - 1]) {
      cout << s.substr(0, lps[i]);
      return 0;
    }
  }
  if (lps[lps[n - 1] - 1] == 0) {
    cout << "Just a legend";
    return 0;
  } else {
    cout << s.substr(0, lps[lps[n - 1] - 1]);
    return 0;
  }
  return 0;
}