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 maxn = 1000005;
string str;
int pi[maxn];
int exist[maxn];
int prefixFunction() {
  int now;
  pi[0] = now = -1;
  int len = str.size();
  for (int i = 1; i < len; i++) {
    while (now != -1 and str[now + 1] != str[i]) now = pi[now];
    if (str[now + 1] == str[i])
      pi[i] = ++now;
    else
      pi[i] = now = -1;
    if (i != len - 1 and pi[i] != -1) exist[pi[i]]++;
  }
  return now;
}
int main() {
  cin >> str;
  int now = prefixFunction();
  while (1) {
    if (now == -1 or exist[now] > 0) {
      break;
    }
    now = pi[now];
  }
  if (now == -1)
    printf("Just a legend\n");
  else {
    for (int i = 0; i <= now; i++) {
      printf("%c", str[i]);
    }
    printf("\n");
  }
  return 0;
}