import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String[] listA = X.split("");
		String ans = "Good";
		for (int i = 0; i < 3; i++) {
			if (listA[i].equals(listA[i + 1])) {
				ans = "Bad";
			}
		}
		System.out.println(ans);
	}
} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String[] listA = X.split("");
		String ans = "Good";
		for (int i = 0; i < 3; i++) {
			if (listA[i].equals(listA[i + 1])) {
				ans = "Bad";
			}
		}
		System.out.println(ans);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String[] listA = X.split("");
		String ans = "Good";
		for (int i = 0; i < 3; i++) {
			if (listA[i].equals(listA[i + 1])) {
				ans = "Bad";
			}
		}
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String[] listA = X.split("");
		String ans = "Good";
		for (int i = 0; i < 3; i++) {
			if (listA[i].equals(listA[i + 1])) {
				ans = "Bad";
			}
		}
		System.out.println(ans);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String X = sc.next(); X sc.next() sc.next sc String[] listA = X.split(""); listA X.split("") X.split X "" String ans = "Good"; ans "Good" for (int i = 0; i < 3; i++) {
			if (listA[i].equals(listA[i + 1])) {
				ans = "Bad";
			}
		} int i = 0; int i = 0; i 0 i < 3 i 3 i++ i++ i {
			if (listA[i].equals(listA[i + 1])) {
				ans = "Bad";
			}
		} {
			if (listA[i].equals(listA[i + 1])) {
				ans = "Bad";
			}
		} if (listA[i].equals(listA[i + 1])) {
				ans = "Bad";
			} listA[i].equals(listA[i + 1]) listA[i].equals listA[i] listA i listA[i + 1] listA i + 1 i 1 {
				ans = "Bad";
			} ans = "Bad" ans "Bad" System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String[] listA = X.split("");
		String ans = "Good";
		for (int i = 0; i < 3; i++) {
			if (listA[i].equals(listA[i + 1])) {
				ans = "Bad";
			}
		}
		System.out.println(ans);
	}
} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String[] listA = X.split("");
		String ans = "Good";
		for (int i = 0; i < 3; i++) {
			if (listA[i].equals(listA[i + 1])) {
				ans = "Bad";
			}
		}
		System.out.println(ans);
	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String X = sc.next();
		String[] listA = X.split("");
		String ans = "Good";
		for (int i = 0; i < 3; i++) {
			if (listA[i].equals(listA[i + 1])) {
				ans = "Bad";
			}
		}
		System.out.println(ans);
	}
}
