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: Runtime Error)

A, B, C, D = map(int, input().split())

def abc131_c_v3(A,B,C,D):
    def gcd(a, b):
        while b:
            a, b = b, a % b
        return a
 
    def lcm(a, b):
        return a // gcd(a, b) * b
 
    a = (A-1) - ((A-1) // C + (A-1) // D - (A-1) // lcm(C, D))
    b = B - (B // C + B // D - B // lcm(C, D))
    print(b-a)
    
abc131_c_v3(A,B,C,D)