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[1000005];
int next[1000005] = {-1};
int sum[1000005], lens;
void getnext(void) {
  int i = 0, j = -1;
  while (i < lens)
    if (j == -1 || s[i] == s[j]) {
      ++i;
      ++j;
      next[i] = j;
    } else
      j = next[j];
}
int main() {
  int i, l;
  while (scanf("%s", s) != EOF) {
    lens = (int)strlen(s);
    getnext();
    memset(sum, 0, sizeof(sum));
    for (i = lens; i; --i) sum[next[i]] += ++sum[i];
    for (l = next[lens]; l; l = next[l])
      if (sum[l] >= 3) break;
    if (l) {
      for (i = 0; i < l; ++i) putchar(s[i]);
      puts("");
    } else
      puts("Just a legend");
  }
  return 0;
}