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 = 2.times.map{gets.to_i}
#=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]}

te=(1..n).map{|i|[i,l+i-1]}
sum = te.inject(0){|s,d|s+d[1]}
i=0
ans=0
key=0
key=1 if !(te.select{|d|d[1]==0}.empty?)

ans=sum if !(te.select{|d|d[1]==0}.empty?)
while ans==0 && key==0 do
  i=i.succ
  ans=sum-i if sum>0 && !(te.select{|d|d[1]==i}.empty?)
  ans=sum+i if sum<0 && !(te.select{|d|d[1]==-i}.empty?)
end
puts ans