import java.util.Scanner;

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

		Scanner sc = new Scanner(System.in);

		String[] getStr = sc.next().split("");
		
		int j = 0;

		for (int i = 0; i < 3; i++) {
			
			if (getStr[i].equals(getStr[i+1])) {

				System.out.println("Bad");
				break;			

			} else {			
				
				j++;	
				
				if (j == 3) {

					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