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 = 1000100;
int nxt[maxn], len;
char s[maxn];
set<int> ss;
void kmp() {
  nxt[0] = 0;
  nxt[1] = 0;
  for (int i = 1; i < len; ++i) {
    int k = nxt[i];
    while (k && s[k] != s[i]) k = nxt[k];
    if (s[k] == s[i])
      nxt[i + 1] = k + 1;
    else
      nxt[i + 1] = 0;
  }
}
int main() {
  scanf("%s", &s);
  len = strlen(s);
  kmp();
  for (int i = 0; i < len; ++i) {
    ss.insert(nxt[i]);
  }
  int tem = nxt[len];
  while (tem) {
    if (ss.count(tem)) {
      for (int i = 0; i < tem; ++i) {
        printf("%c", s[i]);
      }
      return 0;
    } else {
      tem = nxt[tem];
    }
  }
  printf("Just a legend");
  return 0;
}