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 = 1e6 + 5;
int z[N];
void z_algo(string &s) {
  for (int i = 1, L = 0, R = 0; i < s.size(); i++) {
    if (i <= R) z[i] = min(R - i + 1, z[i - L]);
    while (i + z[i] < s.size() && s[z[i]] == s[i + z[i]]) z[i]++;
    if (i + z[i] - 1 > R) R = i + z[i] - 1, L = i;
  }
}
string s;
int main() {
  ios_base::sync_with_stdio(0), cin.tie(0);
  cin >> s;
  z_algo(s);
  int ma = 0, ans = 0;
  for (int i = 1; i < s.size(); i++) {
    if (ma >= z[i] && i + z[i] == s.size()) ans = max(ans, z[i]);
    ma = max(ma, z[i]);
  }
  if (!ans)
    cout << "Just a legend\n";
  else
    cout << s.substr(0, ans);
  return 0;
}