import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		String s = sc.next();
		char before = 0;
		for(int i = 0 ; i < s.length() ; i++) {
			char hoge = s.charAt(i);
			if(before == hoge) {
				System.out.println("Bad");
				System.exit(0);
			}
			before = hoge;
		}
		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