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 max_length = 1e6 + 10;
string S;
int z[max_length];
int main() {
  cin >> S;
  for (int i = 1, l = 0, r = 0, cur_max_length = 0; i < (int)S.length(); ++i) {
    if (i <= r) z[i] = min(r - i + 1, z[i - l]);
    while (i + z[i] < (int)S.length() && S[z[i]] == S[i + z[i]]) ++z[i];
    if (i + z[i] == (int)S.length() && z[i] <= cur_max_length) {
      for (int j = 0; j < z[i]; ++j) cout << S[j];
      return 0;
    }
    cur_max_length = max(cur_max_length, z[i]);
    if (i + z[i] - 1 > r) l = i, r = i + z[i] - 1;
  }
  cout << "Just a legend";
  return 0;
}