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 oo = 0x3f3f3f3f;
const double eps = 1e-9;
string s;
int prefix[1000005];
bool occured[1000005];
int main() {
  getline(cin, s);
  int N = int((s).size());
  int m = prefix[0] = 0;
  for (int i = (1); i < (N); ++i) {
    while (m > 0 && s[m] != s[i]) m = prefix[m - 1];
    if (s[m] == s[i]) m++;
    prefix[i] = m;
  }
  for (int i = (0); i < (N - 1); ++i) occured[prefix[i]] = true;
  int pos = N;
  while (pos > 0) {
    pos = prefix[pos - 1];
    if (occured[pos] && pos) {
      for (int i = (0); i < (pos); ++i) printf("%c", s[i]);
      return 0;
    }
  }
  printf("Just a legend\n");
  return 0;
}