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 lps[1000012];
int occured[1000012];
void LPS(int i, int j, int n, string s) {
  while (j < n) {
    if (s[i] == s[j]) {
      lps[j] = i + 1;
      i++;
      j++;
    } else if (s[i] != s[j]) {
      if (i == 0) {
        j++;
      } else {
        i = lps[i - 1];
      }
    }
  }
}
int main() {
  string s;
  cin >> s;
  int n, i = 0, j = 1;
  n = s.size();
  LPS(i, j, n, s);
  int last = lps[n - 1];
  if (last == 0) {
    cout << "Just a legend" << endl;
    return 0;
  }
  for (i = 0; i <= n - 2; i++) occured[lps[i]] = 1;
  int check = lps[n - 1];
  if (occured[check] == 1) {
    cout << s.substr(0, check) << endl;
    return 0;
  }
  check = lps[check - 1];
  if (check > 0) {
    cout << s.substr(0, check) << endl;
    return 0;
  }
  cout << "Just a legend" << endl;
}