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 N = 1e6 + 10;
char a[N];
int p[N], n, sxl;
int main() {
  cin >> a + 1;
  n = strlen(a + 1);
  p[1] = 0;
  for (int i = 2, j = 0; i <= n; i++) {
    while (j && a[i] != a[j + 1]) j = p[j];
    if (a[i] == a[j + 1]) j++;
    p[i] = j;
    if (i != n) sxl = max(sxl, p[i]);
  }
  int x = p[n];
  if (x == 0) {
    cout << "Just a legend";
  } else {
    while (x > sxl) x = p[x];
    if (x == 0) {
      cout << "Just a legend";
      return 0;
    }
    for (int i = 2; i < n; i++)
      if (x == p[i]) {
        for (int j = i - p[i] + 1; j <= i; j++) cout << a[j];
        cout << endl;
        return 0;
      }
  }
  return 0;
}