import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		String l = sc.next();
		char []a = l.toCharArray();
		int count= 0;
		
		for(int i = 1; i <=3; i++) {
			if(a[i] == a[i-1]) {
				count++;
			}			
		}
		if(count == 0) {
			System.out.println("Good");
		}
		if(count != 0) {
			System.out.println("Bad");
		}

	}

}

/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