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;
const int _maxs = 1000011;
int slen, bord[_maxs], tong[_maxs], rans;
char s[_maxs];
int main() {
  scanf("%s", s + 1);
  slen = strlen(s + 1);
  for (int i = 2, j = 0; i <= slen; ++i) {
    while (j && s[j + 1] != s[i]) {
      j = bord[j];
    }
    if (s[j + 1] == s[i]) {
      ++j;
    }
    bord[i] = j;
    if (i != slen) {
      tong[j] = 1;
    }
  }
  for (int i = bord[slen]; i; i = bord[i]) {
    if (tong[i]) {
      for (int j = 1; j <= i; ++j) {
        putchar(s[j]);
      }
      return 0;
    }
  }
  printf("Just a legend");
  return 0;
}