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>
using namespace std;
int n, lps[1000005];
bool possible[1000005];
char s[1000005];
void gen_lps() {
  for (int i = 1; i < n; i++) {
    int j = lps[i - 1];
    while (j > 0 && s[j] != s[i]) j = lps[j - 1];
    if (s[j] == s[i]) j++;
    lps[i] = j;
  }
}
int main() {
  scanf("%s", s);
  n = strlen(s);
  gen_lps();
  memset(possible, 0, sizeof(possible));
  for (int i = 0; i < n - 1; i++) possible[lps[i]] = true;
  int len = lps[n - 1];
  while (len > 0 && !possible[len]) {
    len = lps[len - 1];
  }
  if (len)
    for (int i = 0; i < len; i++) printf("%c", s[i]);
  else
    printf("Just a legend");
  return 0;
}