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 (GCC 5.4.1) (judge verdict: Runtime Error)

#include<stdio.h>
int main(void){
  long long int a,b,c,d;
  scanf("%lld%lld%lld%lld",&a,&b,&c,&d);
  long long int cnt=0;
  long long int cnt1=0;
  long long int i=0;
  long long int e[b-a+1];
  for(i=a;i<=b;i++){
    if(i % c ==0){
      cnt+=(b/i-a/i);
      if(i%(c*d)==0){
        cnt1+=(b/i-a/i);
      }
      i++;
    }else if(i % d ==0){
      cnt+=(b/i-a/i);
      if(i%(c*d)==0){
        cnt1+=(b/i-a/i);
      }
      i++;
    }

  }


  printf("%lld",a-b+1-cnt+cnt1/2);
  return 0;
}