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)

N = int(input())
arr = [[int(i) for i in input().split()] for j in range(N)]
arr = sorted(arr,key=lambda x:(x[1], x[0]))
i = 0


while i < N-1:
  if (sum(arr[:i+1][0])) > arr[i+1][1]:
    break
  i += 1
    
if i == N-1:
  print("Yes")
else:
  print("No")