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 MX = 2e6 + 9;
const long long mod = 1e9 + 7;
const long long inf = (1ll << 60);
long long f[MX];
long long n;
string s;
void KMP() {
  int i = 0, j = -1;
  f[0] = -1;
  while (i < n) {
    while (j >= 0 && s[i] != s[j]) j = f[j];
    i++;
    j++;
    f[i] = j;
  }
}
int main() {
  cin >> s;
  n = s.size();
  KMP();
  if (f[n] == 0) {
    puts("Just a legend");
    return 0;
  }
  long long mx = f[n];
  for (int i = 1; i < n - 1; i++) {
    if (f[i] == mx) {
      cout << s.substr(0, mx) << endl;
      return 0;
    }
  }
  long long x = f[mx];
  if (x == 0) {
    puts("Just a legend");
    return 0;
  }
  cout << s.substr(0, x) << endl;
}