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 5.4.1) (judge verdict: Accepted)

    #include <stdio.h>
     
    int main(void)
    {
        char num[5];
        if (scanf("%s", num) != -1)
            for (int i = 0; i < 3; i++)
            {
                if (num[i] == num[i + 1])
                {
                    puts("Bad");
                    break;
                }
                else if (num[i] != num[i + 1] && i == 2)
                {
                    puts("Good");
                }
            }
        return 0;
    }