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;
char text[1000005];
int nxt[1000005];
bool visit[1000005];
void prepare() {
  int i = 0, j = -1, len = strlen(text);
  nxt[0] = -1;
  while (i < len) {
    if (j == -1 || text[i] == text[j]) {
      i++;
      j++;
      nxt[i] = j;
    } else {
      j = nxt[j];
    }
  }
}
void work() {
  prepare();
  int len = strlen(text);
  for (int i = 0; i < len; i++) {
    visit[nxt[i]] = 1;
  }
  int pos = len;
  bool flag = 0;
  while (nxt[pos] > 0) {
    if (visit[nxt[pos]]) {
      flag = 1;
      for (int i = 0; i < nxt[pos]; i++) cout << text[i];
      cout << '\n';
      break;
    } else {
      pos = nxt[pos];
    }
  }
  if (!flag) cout << "Just a legend\n";
}
int main() {
  ios::sync_with_stdio(false);
  cin >> text;
  work();
}