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 s[1000006];
int pre[1000006];
int vis[1000005];
void prefix(int l) {
  pre[0] = -1;
  for (int i = 1, j = -1; i <= l; i++) {
    while (j != -1 && s[j] != s[i - 1]) j = pre[j];
    pre[i] = ++j;
  }
}
int main() {
  memset(vis, 0, sizeof(vis));
  cin >> s;
  int l = strlen(s);
  prefix(l);
  int j = l;
  while (j > 0) {
    vis[pre[j]] = 1;
    j = pre[j];
  }
  vis[0] = 0;
  int found = 0;
  int ans = 0;
  for (int i = 2; i < l; i++) {
    if (vis[pre[i]] && pre[i] > ans) {
      found = 1;
      ans = pre[i];
    }
  }
  if (found)
    cout << s + l - ans;
  else
    cout << "Just a legend";
  return 0;
}