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;
vector<int> buildZ(const string& s) {
  int n = (int)s.size();
  ;
  vector<int> z(n);
  int l = 0, r = 0;
  for (int i = 1; i < n; i++) {
    z[i] = max(0, min(z[i - l], r - i));
    while (i + z[i] < n && s[z[i]] == s[i + z[i]]) z[i]++;
    if (i + z[i] > r) {
      r = i + z[i];
      l = i;
    }
  }
  return z;
}
int main() {
  ios::sync_with_stdio(0), cin.tie(0);
  string s;
  cin >> s;
  auto z = buildZ(s);
  int n = (int)s.size();
  ;
  vector<int> p;
  for (int i = 0; i < (int)n; i++)
    if (z[i] != 0) p.push_back(z[i]);
  sort((p).begin(), (p).end());
  int np = (int)p.size();
  ;
  int len = 0;
  for (int i = np - 2; i >= 0; i--) {
    if (z[n - p[i]] == p[i]) len = max(len, p[i]);
  }
  if (!len)
    cout << "Just a legend\n";
  else {
    for (int i = 0; i < (int)len; i++) cout << s[i];
  }
}