import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		String[] SArray = S.split("");
		if(SArray[0].equals(SArray[1])) {
			System.out.println("Bad");
			}else if(SArray[1].equals(SArray[2])) {
					System.out.println("Bad");
				}else if(SArray[2].equals(SArray[3])) {
					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