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 main() {
  int pi, mxl = 0;
  string s;
  cin >> s;
  int n = s.length();
  auto p = vector<int>(n);
  p[0] = pi = -1;
  for (int i = 1; i < n; i++) {
    while (pi != -1 && s[pi + 1] != s[i]) pi = p[pi];
    if (s[pi + 1] == s[i]) pi++;
    p[i] = pi;
  }
  for (int i = n - 1; p[i] != -1; i = p[i]) {
    for (int k = 1; k <= n - 2; k++)
      if (p[k] == p[i]) {
        mxl = p[i] + 1;
        break;
      }
    if (mxl != 0) break;
  }
  string ans = mxl == 0 ? "Just a legend" : s.substr(0, mxl);
  cout << ans << endl;
  return 0;
}