import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int count = 0;
		String secc = sc.next();
      	char[] sec = secc.toCharArray();
		for(int i = 1; i < 4; i++) {
			if (sec[i-1] == sec[i]) {
				count++;
            }
		}
		if (count == 0) {
			System.out.println("Good");
		}
		else {
			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