import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s=sc.next();
		//int n = sc.nextInt();
		//int m = sc.nextInt();
		//int k = sc.nextInt();
		long count=0;
		int[] array = new int[3];
		Arrays.sort(array);

		for(int i=0;i<3;i++) {
			if(s.substring(i,i+1).equals(s.substring(i+1,i+2))) {
				count=1;
				break;
			}
		}
		if(count==0) {
			System.out.println("Good");
		}else {
			System.out.println("Bad");
		}

		//System.out.println(array[0]+array[1]);
	}
}



/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