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;
int build[1000010];
int main() {
  bool f = false;
  string str;
  cin >> str;
  build[0] = -1;
  str += ".";
  for (int i = 0, j = -1; i < str.length();) {
    while (j != -1 && str[i] != str[j]) j = build[j];
    build[++i] = ++j;
  }
  for (int i = build[str.length() - 1]; i > 0 && !f; i = build[i]) {
    for (int j = 1; j < str.length() - 1 && !f; j++) {
      if (build[j] == i) {
        f = true;
        cout << str.substr(0, i) << endl;
      }
    }
  }
  if (!f) cout << "Just a legend" << endl;
  return 0;
}