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)

# a,b,c = 3.times.map(gets.to_i)
r=gets.strip.split("").map(&:to_i)


#.inject(:+)

#cnt=0
#while as.all?(|x|x.even?) do
  # cnt=cnt.succ
# end

# ans = (1..n)
#   .map{|i|[i,j]}
#   .select{|d|a <= d[1] && d[1]<= b}
#   .inject(0){|sum,d|sum+d[0]}
cnt = 0
(0..2).each do |i|
  cnt=1 if r[i]==r[i+1]
end

puts cnt==0 ? "Good" : "Bad"