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;
template <class T>
inline T abs(T a) {
  return a > 0 ? a : -a;
}
int n;
int m;
int p[1000000];
int main() {
  string s;
  cin >> s;
  n = ((int)(s).size());
  p[0] = 0;
  for (int i = 1; i < n; i++) {
    int j = p[i - 1];
    while (j > 0 && s[i] != s[j]) j = p[j - 1];
    if (s[i] == s[j])
      p[i] = j + 1;
    else
      p[i] = 0;
  }
  int imax = 0;
  for (int i = 1; i < n - 1; i++) {
    if (p[i] > p[imax]) imax = i;
  }
  int q = p[n - 1];
  while (q > p[imax]) {
    q = p[q - 1];
  }
  if (q == 0)
    cout << "Just a legend" << endl;
  else {
    for (int i = 0; i < (q); i++) cout << s[i];
    cerr << endl;
  }
  return 0;
}