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;
int z[2000001], m;
int main() {
  string a;
  cin >> a;
  int l = 0, r = 0, ma = 0;
  z[0] = a.size();
  for (int i = 1; i < a.size(); i++) {
    if (i > r) {
      l = i;
      r = i;
      while (a[r] == a[r - l]) r++;
      z[i] = r - l;
      --r;
    } else if (z[i - l] < r - i + 1) {
      z[i] = z[i - l];
    } else {
      l = i;
      while (a[r] == a[r - l]) r++;
      z[i] = r - l;
      --r;
    }
    if (z[i] + i == a.size()) {
      if (z[i] > ma && z[i] <= m) {
        ma = z[i];
      }
    }
    m = max(m, z[i]);
  }
  if (ma) {
    for (int i = 0; i < ma; i++) {
      cout << a[i];
    }
  } else {
    printf("Just a legend");
  }
}