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 N = 1e6 + 10;
char s[N];
int p[N], k;
void kmp() {
  int n = strlen(s + 1);
  for (int i = 2; i <= n; i++) {
    while (k && s[k + 1] != s[i]) k = p[k];
    if (s[k + 1] == s[i]) k++;
    p[i] = k;
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  scanf("%s", s + 1);
  int n = strlen(s + 1);
  kmp();
  int x = 0, ans = p[n];
  for (int i = 2; i < n; i++) x = max(x, p[i]);
  while (ans) {
    if (ans <= x)
      break;
    else
      ans = p[ans];
  }
  if (!ans)
    puts("Just a legend");
  else
    for (int i = 1; i <= ans; i++) printf("%c", s[i]);
  return 0;
}