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 main
 implicit none
 character*80 s,a
 integer*8 i,j
 
 read(*,*) s
 a = s(1:1)
 j = 0
 do i=2,len_trim(s)
  if (a == s(i:i))then
   j = 1
  end if
  a = s(i:i)
 end do
 if(j==0) then
  write(*,*) 'Good'
 else
  write(*,*) 'Bad'
 end if
end program main