101310: [AtCoder]ABC131 A - Security

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