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;
int P[1000001], pr[1000001];
int i, j, c;
int main() {
  getline(cin, s);
  if (int((s).size()) <= 2) {
    cout << "Just a legend" << endl;
    return 0;
  }
  pr[0] = 0;
  P[0] = 0;
  for (i = 1; i <= int((s).size()) - 1; i++) {
    j = pr[i - 1];
    while (j > 0 && s[i] != s[j]) j = pr[j - 1];
    if (s[i] == s[j]) j++;
    pr[i] = j;
    P[i] = max(P[i - 1], pr[i]);
  }
  j = pr[int((s).size()) - 1];
  while (j > 0) {
    if (P[int((s).size()) - 2] >= j) {
      for (c = 0; c <= j - 1; c++) cout << s[c];
      cout << endl;
      return 0;
    }
    j = pr[j - 1];
  }
  cout << "Just a legend" << endl;
}