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 PHP (5.6.30) (judge verdict: Wrong Answer)

            <?php
 fscanf(STDIN, "%d", $N);
     $S = strval($N);
        $arr = str_split($S);
     
 if ($arr[0] === $arr[1] || $arr[1] === $arr[2] || $arr[2] === $arr[3]){
          echo "bad"."\n";
          exit;
        }
        else{
              echo "good"."\n";
        }
            ?>