

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		String s = sc.next();
		char[] c = s.toCharArray();
		String ans = "Good";

		for (int i = 0; i < 3; i++) {
			if (c[i] == c[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 s = sc.next();
		char[] c = s.toCharArray();
		String ans = "Good";

		for (int i = 0; i < 3; i++) {
			if (c[i] == c[i + 1])
				ans = "Bad";
		}
		System.out.println(ans);

	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		String s = sc.next();
		char[] c = s.toCharArray();
		String ans = "Good";

		for (int i = 0; i < 3; i++) {
			if (c[i] == c[i + 1])
				ans = "Bad";
		}
		System.out.println(ans);

	} main {
		Scanner sc = new Scanner(System.in);

		String s = sc.next();
		char[] c = s.toCharArray();
		String ans = "Good";

		for (int i = 0; i < 3; i++) {
			if (c[i] == c[i + 1])
				ans = "Bad";
		}
		System.out.println(ans);

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc char[] c = s.toCharArray(); c s.toCharArray() s.toCharArray s String ans = "Good"; ans "Good" for (int i = 0; i < 3; i++) {
			if (c[i] == c[i + 1])
				ans = "Bad";
		} int i = 0; int i = 0; i 0 i < 3 i 3 i++ i++ i {
			if (c[i] == c[i + 1])
				ans = "Bad";
		} {
			if (c[i] == c[i + 1])
				ans = "Bad";
		} if (c[i] == c[i + 1])
				ans = "Bad"; c[i] == c[i + 1] c[i] c i c[i + 1] c i + 1 i 1 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 s = sc.next();
		char[] c = s.toCharArray();
		String ans = "Good";

		for (int i = 0; i < 3; i++) {
			if (c[i] == c[i + 1])
				ans = "Bad";
		}
		System.out.println(ans);

	}

} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		String s = sc.next();
		char[] c = s.toCharArray();
		String ans = "Good";

		for (int i = 0; i < 3; i++) {
			if (c[i] == c[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 s = sc.next();
		char[] c = s.toCharArray();
		String ans = "Good";

		for (int i = 0; i < 3; i++) {
			if (c[i] == c[i + 1])
				ans = "Bad";
		}
		System.out.println(ans);

	}

}
