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: Runtime Error)

dat = gets.split("\s")
apps = dat[0].to_i
flb = dat[1].to_i
cons = []

i = 0;
apps.times do
    cul = flb + i
    cons.push(cul)
    i = i + 1
end

i = 0;
if cons.index(0) != nil
    i = cons.index(0)
elsif cons.sort.reverse.first < 0
    sml = cons.sort.last
    i = cons.index(sml)
else
    sml = cons.sort.first
    i = cons.index(sml)
end

cons.delete_at(i)
puts cons.inject(:+)