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 = input()
if len(set(s)) == 4:
    print('Good')
elif len(set(s)) == 1:
    print('Bad')
elif len(set(s)) == 2:
    if s[0] == s[2] and s.count(s[0]) == 2:
        print('Good')
    else:
        print('Bad')
else:
    if s[0] == s[1] or s[1] == s[2] or s[2] ==s[3]:
        print('Bad')
    else:
        print('Good')