import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner s = new Scanner(System.in);

		String input = s.next();

		for (int i = 0; i < 3; i++) {

			char c = input.charAt(i);
			char c2 = input.charAt(i+1);

			if(c==c2) {
				System.out.println("Bad");
				return;
			}

		}
		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