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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

/*6.22.a.c*/
#include <stdio.h>
#define N (4)
int main()
{
  char s[N];
  int i,n;
  int b=0;

  scanf("%4s",s);

  for(i=0;i<N;i++)
    {
      if(s[i]==s[i+1])
        {
          b=1;
        }
    }
  if(b==1)
  {
    printf("Bad\n");
  }
  else
  {
    printf("Good\n");
  }

return 0;
}