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(-1.0);
const int n = 1e6 + 10;
string s;
int arr[n];
void build() {
  for (int i = 1; i < s.size(); i++) {
    int j = arr[i - 1];
    while (j > 0 && s[i] != s[j]) j = arr[j - 1];
    if (s[i] == s[j]) j++;
    arr[i] = j;
  }
}
int main() {
  cin >> s;
  memset(arr, 0, sizeof(arr));
  build();
  int val = arr[s.size() - 1];
  int res = -1;
  bool ok = false;
  for (int i = 1; i < s.size() - 1; i++) {
    if (arr[i] == val && val != 0) {
      ok = true;
      res = arr[i];
      break;
    }
  }
  if (!ok && arr[arr[s.size() - 1] - 1] != 0) {
    ok = true;
    res = arr[arr[s.size() - 1] - 1];
  }
  if (!ok || res == 0 || res == -1)
    cout << "Just a legend";
  else
    cout << s.substr(0, res);
  return 0;
}