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: Accepted)

# describe Abc131A do
#   context 'test' do
#     it 'sample' do
#       expect(Abc131A.calc('3776')).to be_falsey
#       expect(Abc131A.calc('8080')).to be_truthy
#       expect(Abc131A.calc('1333')).to be_falsey
#       expect(Abc131A.calc('0024')).to be_falsey
#     end
#   end
# end

class Abc131A
  def self.input()
    password_string = STDIN.gets
  end

  def self.output(result)
    puts (result ? "Good": "Bad")
  end

  def self.calc(password_string)
    !password_string.split(//).map.each_cons(2).map{ |a, b|
      a == b
    }.any?
  end

  def self.main()
    password_string = input()
    result = calc(password_string)
    output(result)
  end
end

if __FILE__ == $0
  Abc131A.main
  exit
end