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;
string st;
int z[1000010], len;
char a[1000010];
void z_alg() {
  z[0] = len;
  for (int i = 1, j = 1, k; i < len; i = k) {
    if (j < i) j = i;
    while (j < len && a[j] == a[j - i]) j++;
    z[i] = j - i;
    k = i + 1;
    while (k + z[k - i] < j) z[k] = z[k - i], k++;
  }
}
int main() {
  cin >> a;
  len = strlen(a);
  z_alg();
  for (int i = 1; i < len; i++)
    if (i + z[i] == len)
      for (int j = 1; j < i; j++)
        if (z[j] >= z[i]) {
          cout << (a + i) << endl;
          return 0;
        }
  puts("Just a legend");
  return 0;
}