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 Python (3.4.3) (judge verdict: Accepted)

S = int(input())
S1=S%10
S2=(S%100-S1)/10
S3=(S%1000-S2*10-S1)/100
S4=(S-S3*100-S2*10-S1)/1000
#print("{}{}{}{}".format(S1,S2,S3,S4))
if S1==S2 or S2==S3 or S3==S4:
    print("Bad")
else:
    print("Good")