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;
const int NMAX = 1000000;
string s;
vector<int> pi;
int main() {
  getline(cin, s);
  int n = s.size();
  s.insert(s.begin(), 0);
  pi.push_back(0);
  pi.push_back(0);
  for (int i = 2, k = 0; i <= n; ++i) {
    while (k > 0 && s[i] != s[k + 1]) k = pi[k];
    pi.push_back(k += int(s[i] == s[k + 1]));
  }
  int p = pi[n];
  bool b = false;
  while (p) {
    int i;
    for (i = p + 1; i < n; ++i)
      if (pi[i] == p) break;
    if (i < n) {
      cout << s.substr(1, p);
      b = true;
      break;
    } else
      p = pi[p];
  }
  if (!b) cout << "Just a legend\n";
  return 0;
}