import java.util.Scanner;
public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int s = sc.nextInt();
        int a = s / 1000;
        int b = s / 100 - 10 * a;
        int c = s / 10 - s / 100 * 10;
        int d = s - s / 10 * 10 ;
        if(a == b || b == c || c == d){
            System.out.println("Bad");
        }else{
            System.out.println("Good");
        }
        sc.close();
    }
}
/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