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: Accepted)


int main() {
    int num1;
    int num2;
    int ans1;
    int ans2=0;
    int count=10;
    int judge=0;
    scanf("%d ", &num1);
    
    for(int i=0;i<=2;i++){
        num2 = num1%count;
        ans1=num2/(count/10);
        num1=num1-num2;
        count=count*10;
        if (i!=0){
            if(ans1==ans2){
                judge=1;
            }
        }
        ans2=ans1;
    }
    
    ans1=num1/1000;
    if(ans1==ans2){
        judge=1;
    }
    
    if(judge==1){
        printf("Bad");
    }else{
        printf("Good");
    }
   return 0;
}