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 MAXN = 1100000;
int f[MAXN];
char s[MAXN];
map<int, int> hsh;
int main() {
  scanf("%s", s);
  int n = strlen(s);
  f[0] = f[1] = 0;
  for (int i = 1; i < n; ++i) {
    int j = f[i];
    while (j && s[i] != s[j]) j = f[j];
    f[i + 1] = s[i] == s[j] ? j + 1 : 0;
  }
  for (int i = 2; i < n; ++i)
    if (f[i] != 0) hsh[f[i] - 1] = 1;
  int x = n;
  while (hsh[f[x] - 1] == 0 && x != 0) x = f[x];
  if (x == 0)
    printf("Just a legend");
  else {
    for (int i = 0; i < f[x]; ++i) printf("%c", s[i]);
  }
  return 0;
}