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;
string s, s1;
int a[5000100];
int b[5000100];
int calc(int k) {
  int res = 0;
  for (int i = 0; i < s1.length(); ++i) {
    if (b[i] == k) res++;
  }
  return res;
}
void pref(int* mas, int n, string str) {
  int k;
  for (int i = 1; i < str.length(); ++i) {
    k = *(mas + i - 1);
    while (k > 0 && str[i] != str[k]) k = *(mas + k - 1);
    if (str[i] == str[k]) k++;
    *(mas + i) = k;
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  cin >> s;
  pref(a, s.length(), s);
  int maxi = a[s.length() - 1], kol;
  while (maxi > 0) {
    s1 = s.substr(0, maxi) + "$" + s;
    pref(b, s1.length(), s1);
    if (calc(maxi) > 2) {
      cout << s.substr(0, maxi);
      return 0;
    }
    maxi = a[maxi - 1];
  }
  cout << "Just a legend";
  return 0;
}