import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char temp='a';
		char[] s = sc.next().toCharArray();
		String ans = "Good";
		for (char c : s) {
			if(temp == c) ans = "Bad";
			temp = c;
		}
		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);
		char temp='a';
		char[] s = sc.next().toCharArray();
		String ans = "Good";
		for (char c : s) {
			if(temp == c) ans = "Bad";
			temp = c;
		}
		System.out.println(ans);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char temp='a';
		char[] s = sc.next().toCharArray();
		String ans = "Good";
		for (char c : s) {
			if(temp == c) ans = "Bad";
			temp = c;
		}
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
		char temp='a';
		char[] s = sc.next().toCharArray();
		String ans = "Good";
		for (char c : s) {
			if(temp == c) ans = "Bad";
			temp = c;
		}
		System.out.println(ans);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) char temp='a'; temp 'a' char[] s = sc.next().toCharArray(); s sc.next().toCharArray() sc.next().toCharArray sc.next() sc.next sc String ans = "Good"; ans "Good" for (char c : s) {
			if(temp == c) ans = "Bad";
			temp = c;
		} char c s {
			if(temp == c) ans = "Bad";
			temp = c;
		} {
			if(temp == c) ans = "Bad";
			temp = c;
		} if(temp == c) ans = "Bad"; temp == c temp c ans = "Bad" ans "Bad" temp = c temp c 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);
		char temp='a';
		char[] s = sc.next().toCharArray();
		String ans = "Good";
		for (char c : s) {
			if(temp == c) ans = "Bad";
			temp = c;
		}
		System.out.println(ans);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char temp='a';
		char[] s = sc.next().toCharArray();
		String ans = "Good";
		for (char c : s) {
			if(temp == c) ans = "Bad";
			temp = c;
		}
		System.out.println(ans);
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char temp='a';
		char[] s = sc.next().toCharArray();
		String ans = "Good";
		for (char c : s) {
			if(temp == c) ans = "Bad";
			temp = c;
		}
		System.out.println(ans);
	}
}
