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 N = 1e6 + 5;
char s[N];
int Lps[N];
int main() {
  scanf("%s", s);
  int n = strlen(s);
  int i = 1, j = 0;
  set<int> set;
  while (i < n) {
    if (s[i] == s[j]) {
      Lps[i] = j + 1;
      if (i < n - 1) set.insert(Lps[i]);
      i++, j++;
    } else {
      if (j == 0)
        i++;
      else
        j = Lps[j - 1];
    }
  }
  int res = Lps[n - 1];
  while (res > 0 && set.find(res) == set.end()) {
    res = Lps[res - 1];
  }
  if (res == 0) {
    printf("Just a legend");
  } else {
    s[res] = '\0';
    printf("%s", s);
  }
}