import java.util.Scanner;

public class Main{

    public static void main(String[] args) {
        Scanner sc = new Scanner(System. in);
        String password = sc.next();  
      
     // int n = sc.nextInt();
        String ans = "Good";

        for(int i = 0; i < 3; i++) {
            if (password.substring(i,i+1).equals(password.substring(i+1,i+2))) {
                ans = "Bad";
            }
//            System.out.println(password.substring(i,i+2));
        }

        System.out.println(ans);
    }

}
/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