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){
    int N,L;
    int num[201];
    int i,subnum;
    int origin=0;
    int fixed;
    scanf("%d %d",&N,&L);
    for(i=0;i<N;i++){
        num[i] = L+i;
    }
    if(L>=0){
        subnum = num[0]; // 味が正数だったら
    }else{
        for(i=0;i<N;i++){
            if(num[i] == 0){
                subnum = 0; // 0を含んでいたら
            }
        }
        // subnum = num[N-1];
    }
    if(num[N-1] < 0) subnum = num[N-1];
    for(i=0;i<N;i++){
        origin += L+i;
    }
    fixed = origin - subnum;
    printf("%d\n",fixed);
    return 0;
}