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 double pi = acos(-1);
const int N = (int)1e6 + 7, mod = 1000000007, M = 2e9;
int n, rcv[N], t;
bool c[N];
string s;
void fail() {
  int k = 0;
  for (int i = 1; i < n; i++) {
    while (k && s[i] != s[k]) k = rcv[k - 1];
    if (s[i] == s[k]) {
      rcv[i] = ++k;
      c[k] |= i < n - 1;
    }
  }
}
int main() {
  cin >> s;
  n = s.size();
  fail();
  t = rcv[n - 1];
  while (t) {
    if (c[t]) {
      for (int i = 0; i < t; i++) cout << s[i];
      return 0;
    }
    t = rcv[t - 1];
  }
  cout << "Just a legend";
  return 0;
}