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 = 1000005;
char s[maxn];
int Next[maxn], n, vis[maxn];
void getNext() {
  Next[0] = Next[1] = 0;
  for (int i = 1; i < n; i++) {
    int j = Next[i];
    while (j && s[i] != s[j]) j = Next[j];
    if (s[i] == s[j])
      Next[i + 1] = j + 1;
    else
      Next[i + 1] = 0;
  }
}
int main() {
  scanf("%s", s);
  n = strlen(s);
  getNext();
  memset(vis, false, sizeof(vis));
  for (int i = 1; i < n; i++) vis[Next[i]] = true;
  int i = n;
  bool flag = false;
  while (Next[i] != 0) {
    if (vis[Next[i]]) {
      for (int j = 0; j < Next[i]; j++) printf("%c", s[j]);
      flag = true;
      break;
    }
    i = Next[i];
  }
  if (!flag) printf("Just a legend\n");
  printf("\n");
  return 0;
}