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)

#include <stdio.h>
int main(){
    int a,b,c,d,e,f,g,h;
    scanf("%d",&a);
    b=a/1000;
    b=b*1000;
    c=a/100;
    c=c*100;
    d=a/10;
    d=d*10;
    e=(c-b)/100;
    f=b/1000;
    g=(d-c)/10;
    h=a-d;
    if(f==e||e==g||g==h){
        printf("Bad");
    }else{
        printf("Good");
    }
    return 0;
}