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[1000010];
int next_[1000010], vis[1000010];
void getnext() {
  int i = 0, j = -1;
  int len = strlen(s);
  next_[0] = -1;
  while (i < len) {
    if (j == -1 || s[i] == s[j])
      next_[++i] = ++j;
    else
      j = next_[j];
  }
}
int main() {
  int i;
  while (~scanf("%s", s)) {
    int len = strlen(s);
    getnext();
    memset(vis, 0, sizeof(vis));
    for (i = 1; i < len; i++) vis[next_[i]] = 1;
    int j = len, flag = 0;
    while (next_[j] > 0) {
      if (vis[next_[j]]) {
        for (i = 0; i < next_[j]; i++) printf("%c", s[i]);
        printf("\n");
        flag = 1;
        break;
      }
      j = next_[j];
    }
    if (!flag) printf("Just a legend\n");
  }
  return 0;
}