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 std::cin;
using std::cout;
using std::endl;
using std::string;
using std::vector;
int main(int argc, const char* argv[]) {
  string input;
  cin >> input;
  vector<int> table(input.size() + 1);
  int i = 0;
  int j = -1;
  int max = 0;
  table[i] = j;
  while (i < input.size()) {
    while (j >= 0 && input[i] != input[j]) j = table[j];
    i++;
    j++;
    table[i] = j;
    if (i < input.size()) {
      max = std::max(max, table[i]);
    }
  }
  table[0] = 0;
  j = table[input.size()];
  while (j > max) {
    j = table[j];
  }
  if (0 == j) {
    cout << "Just a legend" << endl;
  } else {
    cout << input.substr(0, j) << endl;
  }
  return 0;
}