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 Common Lisp (SBCL 1.1.14) (judge verdict: Runtime Error)

(defparameter seq (subseq (read-line) 0 4)

(defun check (text)
  (if (or (eq (char text 0)
              (char text 1))
          (eq (char text 1)
              (char text 2))
          (eq (char text 2)
              (char text 3)))
      "Bad"
      "Good")))

(print (check seq))