import java.util.Scanner;

class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        char A[] = S.toCharArray();

        int count = 0;
        for(int i = 0;i < 3;i++){
            if(A[i] == A[i+1]){
                count++;
            }
        }
        if(count > 0){
            System.out.println("Bad");
        }else{
            System.out.println("Good");
        }

    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz