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 str[1000005];
int save[1000005], next[1000005], len;
void count() {
  int i, j;
  next[0] = -1;
  for (i = 0, j = -1; i < len;) {
    if (str[i] != str[j] && j != -1) {
      j = next[j];
    } else {
      i++;
      j++;
      next[i] = j;
    }
  }
  for (i = 0; i < len; i++) save[next[i]]++;
}
int main() {
  int i, j, k, flag;
  while (scanf("%s", str) != EOF) {
    memset(save, 0, sizeof(save));
    len = strlen(str);
    count();
    flag = 0;
    for (i = len;; i = next[i]) {
      if (next[i] <= 0) break;
      if (save[next[i]]) {
        for (j = 0; j < next[i]; j++) printf("%c", str[j]);
        printf("\n");
        flag = 1;
        break;
      }
    }
    if (!flag) printf("Just a legend\n");
  }
  return 0;
}