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>
int main() {
  char s[1000000 + 1];
  scanf("%s", s);
  int n = strlen(s), k = 0, l[1000000] = {0};
  for (int i = 1; i < n; i++) {
    while (k > 0 && s[k] != s[i]) k = l[k - 1];
    if (s[k] == s[i]) k++;
    l[i] = k;
  }
  if (l[n - 1] == 0) {
    puts("Just a legend");
    return 0;
  }
  for (int i = 0; i < n - 1; i++)
    if (l[i] == l[n - 1]) {
      s[l[i]] = '\0';
      puts(s);
      return 0;
    }
  if (l[l[n - 1] - 1] == 0) {
    puts("Just a legend");
    return 0;
  }
  s[l[l[n - 1] - 1]] = '\0';
  puts(s);
  return 0;
}