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 NMAX = 1e6 + 5;
string s;
int pref[NMAX];
int cnt[NMAX];
int main() {
  int N, i, j;
  cin >> s;
  N = s.size();
  if (N == 1) {
    cout << "Just a legend";
    return 0;
  }
  for (i = 1, j = 0; i < N; ++i) {
    if (s[i] == s[j])
      pref[i] = ++j;
    else {
      if (j > 0) {
        j = pref[j - 1];
        i--;
      }
    }
  }
  for (i = 0; i < N; ++i) cnt[pref[i]]++;
  if (pref[N - 1] == 0) {
    cout << "Just a legend";
    return 0;
  } else if (cnt[pref[N - 1]] > 1) {
    for (i = 0; i < pref[N - 1]; ++i) cout << s[i];
    return 0;
  } else {
    j = pref[pref[N - 1] - 1];
    if (j > 0) {
      for (i = 0; i < j; ++i) cout << s[i];
    } else {
      cout << "Just a legend";
    }
    return 0;
  }
}