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 MAX = 1000007;
string s;
int pi[MAX];
char p[MAX], p2[MAX], T;
void compute_prefix_function(int m) {
  int k = pi[0] = -1;
  for (int i = 1; i < m; i++) {
    while (k >= 0 && s[i] != s[k + 1]) k = pi[k];
    if (s[i] == s[k + 1]) k++;
    pi[i] = k;
  }
}
int main() {
  cin >> s;
  compute_prefix_function(s.size());
  int ans = pi[s.size() - 1];
  if (ans == -1) {
    cout << "Just a legend\n";
    return 0;
  }
  for (int i = 1; i < s.size() - 1; i++) {
    if (ans == pi[i]) {
      cout << s.substr(0, ans + 1) << '\n';
      return 0;
    }
  }
  ans = pi[ans];
  if (ans == -1)
    cout << "Just a legend\n";
  else
    cout << s.substr(0, ans + 1) << '\n';
  return 0;
}