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;
string s;
int Next[1000006] = {0}, Hash[1000006] = {0};
void kmp() {
  int len = s.length() - 1;
  for (int i = 2; i <= len; ++i) {
    int k = Next[i - 1];
    while (k && s[k + 1] != s[i]) k = Next[k];
    if (s[k + 1] == s[i]) Next[i] = k + 1;
  }
}
int main() {
  cin >> s;
  s = " " + s;
  kmp();
  int len = s.length() - 1;
  for (int i = 2; i < len; ++i) Hash[Next[i]] = 1;
  int x = Next[len];
  while (!Hash[x] && x) x = Next[x];
  if (!x)
    cout << "Just a legend" << endl;
  else {
    for (int i = 1; i <= x; ++i) cout << s[i];
    cout << endl;
  }
}