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 Ruby (2.3.3) (judge verdict: Wrong Answer)

n, l = gets.split(' ')

N = n.to_i
L = l.to_i
abs_min = 9999999999
ret_val = 9999999999
(0..N-1).each do |i|
  eated_taste = i + L
  sum = 0
  (0..N-1).each do |sum_i|
    sum = sum + sum_i + L unless sum_i == i
  end
  if (sum - eated_taste).abs < abs_min
    ret_val = sum
    abs_min = (sum - eated_taste).abs
  end
end

puts ret_val