import java.util.Scanner;

public class Main {
	public static void main(String arg[]) {

		Scanner sc = new Scanner(System.in);

		int S = sc.nextInt();

		int a = S / 1000;
		int b = S % 1000 / 100;
		int c = S % 1000 % 100 / 10;
		int d = S % 1000 % 100 % 10;

		if (a == b || b == c || c == d) {
			System.out.print("Bad");
		} else {
			System.out.print("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