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;
long i, j, n, k, xl, yl, len = -1;
string s1, s2, s;
vector<long> pi(1000001), ans(1000001);
char c;
int main() {
  cin >> s;
  n = s.length();
  for (i = 1; i < n; i++) {
    j = pi[i - 1];
    while (s[j] != s[i] && j > 0) j = pi[j - 1];
    if (s[j] == s[i]) ++j;
    pi[i] = j;
  }
  for (i = 0; i < n; i++) {
    ans[pi[i]]++;
  }
  for (i = n - 1; i > 0; i--) {
    ans[pi[i - 1]] += ans[i];
  }
  for (i = pi[n - 1]; i > 0;) {
    if (ans[i] >= 2) {
      len = i;
      break;
    }
    i = pi[i - 1];
  }
  if (len < 0)
    cout << "Just a legend";
  else
    cout << s.substr(n - len, n - 1);
  return 0;
}