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.