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[1000040];
int len, next[1000040], hash[1000040];
void GetNext() {
  int i = 0, j = -1;
  next[i] = -1;
  while (i < len) {
    if (j == -1 || str[i] == str[j])
      i++, j++, next[i] = j;
    else
      j = next[j];
  }
  for (i = 1; i < len; ++i) hash[next[i]]++;
}
int main() {
  int i, j, k, flag;
  while (scanf("%s", str) != EOF) {
    len = strlen(str);
    memset(hash, 0, sizeof(hash));
    GetNext();
    flag = 0, i = len;
    while (next[i] != 0) {
      if (hash[next[i]]) {
        for (j = 0; j < next[i]; ++j) printf("%c", str[j]);
        flag = 1;
        break;
      }
      i = next[i];
    }
    if (flag == 0) printf("Just a legend");
    printf("\n");
  }
  return 0;
}