import java.util.Scanner;

public class Main {

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

		boolean good = true;

		for(int i = 0; i < 3; i++) {
			if(pass.charAt(i)==pass.charAt(i+1)){
				good = false;
			}
		}

		if(good) {
			System.out.println("Good");
		}else {
			System.out.println("Bad");
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {

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

		boolean good = true;

		for(int i = 0; i < 3; i++) {
			if(pass.charAt(i)==pass.charAt(i+1)){
				good = false;
			}
		}

		if(good) {
			System.out.println("Good");
		}else {
			System.out.println("Bad");
		}
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String pass = sc.next();

		boolean good = true;

		for(int i = 0; i < 3; i++) {
			if(pass.charAt(i)==pass.charAt(i+1)){
				good = false;
			}
		}

		if(good) {
			System.out.println("Good");
		}else {
			System.out.println("Bad");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		String pass = sc.next();

		boolean good = true;

		for(int i = 0; i < 3; i++) {
			if(pass.charAt(i)==pass.charAt(i+1)){
				good = false;
			}
		}

		if(good) {
			System.out.println("Good");
		}else {
			System.out.println("Bad");
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String pass = sc.next(); pass sc.next() sc.next sc boolean good = true; good true for(int i = 0; i < 3; i++) {
			if(pass.charAt(i)==pass.charAt(i+1)){
				good = false;
			}
		} int i = 0; int i = 0; i 0 i < 3 i 3 i++ i++ i {
			if(pass.charAt(i)==pass.charAt(i+1)){
				good = false;
			}
		} {
			if(pass.charAt(i)==pass.charAt(i+1)){
				good = false;
			}
		} if(pass.charAt(i)==pass.charAt(i+1)){
				good = false;
			} pass.charAt(i)==pass.charAt(i+1) pass.charAt(i) pass.charAt pass i pass.charAt(i+1) pass.charAt pass i+1 i 1 {
				good = false;
			} good = false good false if(good) {
			System.out.println("Good");
		}else {
			System.out.println("Bad");
		} good {
			System.out.println("Good");
		} System.out.println("Good") System.out.println System.out System System.out "Good" {
			System.out.println("Bad");
		} System.out.println("Bad") System.out.println System.out System System.out "Bad" String[] args args public class Main {

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

		boolean good = true;

		for(int i = 0; i < 3; i++) {
			if(pass.charAt(i)==pass.charAt(i+1)){
				good = false;
			}
		}

		if(good) {
			System.out.println("Good");
		}else {
			System.out.println("Bad");
		}
	}
} public class Main {

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

		boolean good = true;

		for(int i = 0; i < 3; i++) {
			if(pass.charAt(i)==pass.charAt(i+1)){
				good = false;
			}
		}

		if(good) {
			System.out.println("Good");
		}else {
			System.out.println("Bad");
		}
	}
} Main
import java.util.Scanner;

public class Main {

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

		boolean good = true;

		for(int i = 0; i < 3; i++) {
			if(pass.charAt(i)==pass.charAt(i+1)){
				good = false;
			}
		}

		if(good) {
			System.out.println("Good");
		}else {
			System.out.println("Bad");
		}
	}
}