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>
const int N = 1e6 + 3;
int n, za[N], p;
char a[N];
int main() {
  scanf("%s", a + 1), n = strlen(a + 1);
  za[1] = n;
  for (int i = 2, j = 0; i <= n; i++) {
    if (j + za[j] > i) za[i] = std::min(j + za[j] - i, za[i - j + 1]);
    for (; i + za[i] <= n && a[1 + za[i]] == a[i + za[i]]; ++za[i])
      ;
    if (i + za[i] > j + za[j]) j = i;
    if (!p && i + za[i] - 1 == n) p = i;
  }
  for (int i = 2; i <= n; i++) {
    if (i < p && za[i] >= za[p]) return 0 * printf("%s\n", a + p);
    if (i > p && i + za[i] - 1 == n) return 0 * printf("%s\n", a + i);
  }
  return 0 * puts("Just a legend");
}