

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner sc = new Scanner(System.in);
		String line = sc.nextLine();
		String[] lines = line.split("");
		boolean flag = true;
		int before = Integer.parseInt(lines[0]);

		for(int i = 1 ; i < lines.length ; i++) {
			int after = Integer.parseInt(lines[i]);
			if(before == after) {
				flag = false;
				break;
			}
			before = after;
		}

		if(flag) {
			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