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>
char s[15000005];
int n, fail[15000005], num[15000005];
int main() {
  scanf("%s", s + 1);
  n = strlen(s + 1);
  int j = 0;
  for (int i = 1; i <= n; i++) {
    for (; j && s[j + 1] != s[i]; j = fail[j])
      ;
    if (s[j + 1] == s[i] && j + 1 != i) j++;
    fail[i] = j;
  }
  for (int i = n; i >= 1; i--) {
    ++num[i];
    num[fail[i]] += num[i];
  }
  while (n) {
    if (num[fail[n]] > 2 && fail[n]) {
      for (int i = 1; i <= fail[n]; i++) printf("%c", s[i]);
      return 0;
    }
    n = fail[n];
  }
  printf("Just a legend\n");
}