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 l, k;
int d[1000005];
char s[1000005];
int main() {
  int i;
  cin >> s;
  for (i = 1; s[i]; i++) {
    if (i < l + d[l])
      k = min(d[i - l], l + d[l] - i);
    else
      k = 0;
    for (; s[i + k]; k++)
      if (s[i + k] != s[k]) break;
    d[i] = k;
    if (i + k > l + d[l]) l = i;
  }
  int len = i;
  if (len < 3) {
    cout << "Just a legend" << endl;
    exit(0);
  }
  int u = 0;
  for (i = 1; i < len; i++) {
    if (i + d[i] == len && u >= d[i]) break;
    u = max(u, d[i]);
  }
  if (i == len)
    cout << "Just a legend" << endl;
  else
    cout << s + i << endl;
  return 0;
}