import java.util.Scanner;

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

		for(int i=0; i<S.length()-1; i++) {
			if(S.charAt(i)==S.charAt(i+1)) {
				System.out.println("Bad");
				return;
			}
		}
		System.out.println("Good");
	}
} 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.nextLine();

		for(int i=0; i<S.length()-1; i++) {
			if(S.charAt(i)==S.charAt(i+1)) {
				System.out.println("Bad");
				return;
			}
		}
		System.out.println("Good");
	}
} Main public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		String S = sc.nextLine();

		for(int i=0; i<S.length()-1; i++) {
			if(S.charAt(i)==S.charAt(i+1)) {
				System.out.println("Bad");
				return;
			}
		}
		System.out.println("Good");
	} main {
		Scanner sc = new Scanner(System.in);
		String S = sc.nextLine();

		for(int i=0; i<S.length()-1; i++) {
			if(S.charAt(i)==S.charAt(i+1)) {
				System.out.println("Bad");
				return;
			}
		}
		System.out.println("Good");
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.nextLine(); S sc.nextLine() sc.nextLine sc for(int i=0; i<S.length()-1; i++) {
			if(S.charAt(i)==S.charAt(i+1)) {
				System.out.println("Bad");
				return;
			}
		} int i=0; int i=0; i 0 i<S.length()-1 i S.length()-1 S.length() S.length S 1 i++ i++ i {
			if(S.charAt(i)==S.charAt(i+1)) {
				System.out.println("Bad");
				return;
			}
		} {
			if(S.charAt(i)==S.charAt(i+1)) {
				System.out.println("Bad");
				return;
			}
		} if(S.charAt(i)==S.charAt(i+1)) {
				System.out.println("Bad");
				return;
			} S.charAt(i)==S.charAt(i+1) S.charAt(i) S.charAt S i S.charAt(i+1) S.charAt S i+1 i 1 {
				System.out.println("Bad");
				return;
			} System.out.println("Bad") System.out.println System.out System System.out "Bad" return; System.out.println("Good") System.out.println System.out System System.out "Good" String args[] args public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		String S = sc.nextLine();

		for(int i=0; i<S.length()-1; i++) {
			if(S.charAt(i)==S.charAt(i+1)) {
				System.out.println("Bad");
				return;
			}
		}
		System.out.println("Good");
	}
} public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		String S = sc.nextLine();

		for(int i=0; i<S.length()-1; i++) {
			if(S.charAt(i)==S.charAt(i+1)) {
				System.out.println("Bad");
				return;
			}
		}
		System.out.println("Good");
	}
} Main
import java.util.Scanner;

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

		for(int i=0; i<S.length()-1; i++) {
			if(S.charAt(i)==S.charAt(i+1)) {
				System.out.println("Bad");
				return;
			}
		}
		System.out.println("Good");
	}
}
