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;
int B[1000000];
bool vis[1000000];
int main() {
  string pattern;
  cin >> pattern;
  int i, j;
  vector<int> B(pattern.size() + 1, -1);
  i = 0;
  j = -1;
  int m = pattern.size();
  B[i] = j;
  while (i < m) {
    while (j >= 0 && pattern[i] != pattern[j]) j = B[j];
    i++;
    j++;
    B[i] = j;
  }
  memset(vis, false, sizeof vis);
  for (i = 2; i < m; i++) vis[B[i]] = true;
  int index = B[m];
  while (!vis[index] && index) {
    index = B[index];
  }
  if (!index) {
    printf("Just a legend\n");
  } else {
    string ans = pattern.substr(0, index);
    cout << ans << endl;
  }
  return 0;
}