Problem:
Score : 100 points

Problem Statement

The door of Snuke's laboratory is locked with a security code.

The security code is a 4-digit number. We say the security code is hard to enter when it contains two consecutive digits that are the same.

You are given the current security code S. If S is hard to enter, print Bad; otherwise, print Good.

Constraints

S is a 4-character string consisting of digits.

Input

Input is given from Standard Input in the following format:

S

Output

If S is hard to enter, print Bad; otherwise, print Good.

Sample Input 1

3776

Sample Output 1

Bad

The second and third digits are the same, so 3776 is hard to enter.

Sample Input 2

8080

Sample Output 2

Good

There are no two consecutive digits that are the same, so 8080 is not hard to enter.

Sample Input 3

1333

Sample Output 3

Bad

Sample Input 4

0024

Sample Output 4

Bad

Solution in C (GCC 9.2.1) (judge verdict: Accepted)

#include<stdio.h>

int main(void) {
   char s[4];
   int cnt = 0;

   scanf("%s", s);
   
   for(int i = 0; i < 3; i++) {
      if(s[i] == s[i+1]) {
         cnt++;
      }
   }

   if(cnt == 0) {
      printf("Good\n");
   } else {
      printf("Bad\n");
   }
   return 0;
}