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 mx = 1e6 + 7;
char s[mx];
int nxt[mx];
map<int, int> vis;
void kmp(char x[], int n) {
  int i = 0, j = nxt[0] = -1;
  while (i < n) {
    while (j != -1 && x[i] != x[j]) j = nxt[j];
    nxt[++i] = ++j;
  }
  for (int k = 0; k < n; k++) vis[nxt[k]]++;
}
int main() {
  scanf("%s", s);
  int len = strlen(s);
  kmp(s, len);
  int i = len;
  while (nxt[i] > 0) {
    if (vis[nxt[i]]) {
      for (int j = 0; j < nxt[i]; j++) putchar(s[j]);
      return 0;
    }
    i = nxt[i];
  }
  printf("Just a legend\n");
  return 0;
}