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 (2.7.1) (judge verdict: Accepted)

s = gets.chomp.split('').map(&:to_i)
i = 0
switch = false
while i < s.size-1
  # puts "s[i]:#{s[i]}  s[i+1]:#{s[i+1]}"
  if s[i] == s[i+1]
    switch = true
  end
  i += 1
end

if switch
  puts "Bad"
else
  puts "Good"
end