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;
int nxt[1000100], len;
char S[1000100];
bool appear[1000100];
int main() {
  scanf("%s", S + 1);
  len = strlen(S + 1);
  for (int i = 2; i <= len; ++i) {
    int j = nxt[i - 1];
    while (j && S[j + 1] != S[i]) j = nxt[j];
    nxt[i] = j + (S[j + 1] == S[i]);
  }
  for (int i = 2; i < len; ++i) appear[nxt[i]] = 1;
  for (int i = len; i; --i) appear[nxt[i]] |= appear[i];
  int ans = nxt[len];
  while (ans && !appear[ans]) ans = nxt[ans];
  if (ans == 0)
    printf("Just a legend\n");
  else
    S[ans + 1] = 0, printf("%s", S + 1);
  scanf("%s", S + 1);
  return 0;
}