import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String sa = sc.nextLine();
		sc.close();
		char one = sa.charAt(0);
		char two = sa.charAt(1);
		char three = sa.charAt(2);
		char four = sa.charAt(3);
		if((one == two) ||(two == three) || (three == four)) {
			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