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 Fortran (gfortran v4.8.4) (judge verdict: Accepted)

program sc
  implicit none
  integer :: i,muzu
  character(len=4) :: S

  read(*,*) S
  muzu=0
  do i=1,3
     if(S(i:i).eq.S(i+1:i+1)) then
        muzu=1
     endif
  enddo
  if(muzu.eq.0) then
     write(*,'(a)') 'Good'
  else
     write(*,'(a)') 'Bad'
  endif



end program sc