import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		String a = sc.next();
		char[] array = a.toCharArray();
		for(int i = 0; i < array.length - 1; i++) {
			if(array[i] == array[i + 1]) {
				System.out.println("Bad");
				System.exit(0);
			}
		}
		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 a = sc.next();
		char[] array = a.toCharArray();
		for(int i = 0; i < array.length - 1; i++) {
			if(array[i] == array[i + 1]) {
				System.out.println("Bad");
				System.exit(0);
			}
		}
		System.out.println("Good");
	}
} Main public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		String a = sc.next();
		char[] array = a.toCharArray();
		for(int i = 0; i < array.length - 1; i++) {
			if(array[i] == array[i + 1]) {
				System.out.println("Bad");
				System.exit(0);
			}
		}
		System.out.println("Good");
	} main {
		
		Scanner sc = new Scanner(System.in);
		String a = sc.next();
		char[] array = a.toCharArray();
		for(int i = 0; i < array.length - 1; i++) {
			if(array[i] == array[i + 1]) {
				System.out.println("Bad");
				System.exit(0);
			}
		}
		System.out.println("Good");
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String a = sc.next(); a sc.next() sc.next sc char[] array = a.toCharArray(); array a.toCharArray() a.toCharArray a for(int i = 0; i < array.length - 1; i++) {
			if(array[i] == array[i + 1]) {
				System.out.println("Bad");
				System.exit(0);
			}
		} int i = 0; int i = 0; i 0 i < array.length - 1 i array.length - 1 array.length array array.length 1 i++ i++ i {
			if(array[i] == array[i + 1]) {
				System.out.println("Bad");
				System.exit(0);
			}
		} {
			if(array[i] == array[i + 1]) {
				System.out.println("Bad");
				System.exit(0);
			}
		} if(array[i] == array[i + 1]) {
				System.out.println("Bad");
				System.exit(0);
			} array[i] == array[i + 1] array[i] array i array[i + 1] array i + 1 i 1 {
				System.out.println("Bad");
				System.exit(0);
			} System.out.println("Bad") System.out.println System.out System System.out "Bad" System.exit(0) System.exit System 0 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 a = sc.next();
		char[] array = a.toCharArray();
		for(int i = 0; i < array.length - 1; i++) {
			if(array[i] == array[i + 1]) {
				System.out.println("Bad");
				System.exit(0);
			}
		}
		System.out.println("Good");
	}
} public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		String a = sc.next();
		char[] array = a.toCharArray();
		for(int i = 0; i < array.length - 1; i++) {
			if(array[i] == array[i + 1]) {
				System.out.println("Bad");
				System.exit(0);
			}
		}
		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 a = sc.next();
		char[] array = a.toCharArray();
		for(int i = 0; i < array.length - 1; i++) {
			if(array[i] == array[i + 1]) {
				System.out.println("Bad");
				System.exit(0);
			}
		}
		System.out.println("Good");
	}
}