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;
const int N = 1000007;
int phi[N];
void build(string& s) {
  phi[0] = 0;
  for (int i = 1; i < s.size(); i++) {
    int j = phi[i - 1];
    while (j and s[i] != s[j]) j = phi[j - 1];
    if (s[i] == s[j])
      phi[i] = j + 1;
    else
      phi[i] = 0;
  }
}
int main() {
  string s;
  cin >> s;
  build(s);
  int bestmid = 0;
  for (int i = 1; i < s.size() - 1; i++) bestmid = max(bestmid, phi[i]);
  int j = phi[s.size() - 1];
  while (j > bestmid) j = phi[j - 1];
  if (!j)
    cout << "Just a legend\n";
  else
    cout << s.substr(0, j) << '\n';
  return 0;
}