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>
#pragma GCC optimize("O2")
const int MAXN = 1e6 + 5;
const int mod = 1e9 + 7;
using namespace std;
int oc[MAXN];
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  string a;
  cin >> a;
  vector<int> f((int)a.size());
  int border = 0;
  f[0] = 0;
  for (int i = 1; i < (int)a.size(); i++) {
    while (a[border] != a[i] && border > 0) border = f[border - 1];
    if (a[border] == a[i]) border++;
    f[i] = border;
    oc[border]++;
  }
  if (border && border != (int)a.size() && oc[border] > 1)
    cout << a.substr(0, border);
  else if (border && f[border - 1] != 0)
    cout << a.substr(0, f[border - 1]);
  else
    cout << "Just a legend";
  return 0;
}