import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] arr = sc.next().toCharArray();
		for (int i = 1; i < arr.length; i++) {
			if (arr[i] == arr[i - 1]) {
				System.out.println("Bad");
				return;
			}
		}
		System.out.println("Good");
	}
} import java.util.*; util.* java public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] arr = sc.next().toCharArray();
		for (int i = 1; i < arr.length; i++) {
			if (arr[i] == arr[i - 1]) {
				System.out.println("Bad");
				return;
			}
		}
		System.out.println("Good");
	}
} Main public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] arr = sc.next().toCharArray();
		for (int i = 1; i < arr.length; i++) {
			if (arr[i] == arr[i - 1]) {
				System.out.println("Bad");
				return;
			}
		}
		System.out.println("Good");
	} main {
		Scanner sc = new Scanner(System.in);
		char[] arr = sc.next().toCharArray();
		for (int i = 1; i < arr.length; i++) {
			if (arr[i] == arr[i - 1]) {
				System.out.println("Bad");
				return;
			}
		}
		System.out.println("Good");
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) char[] arr = sc.next().toCharArray(); arr sc.next().toCharArray() sc.next().toCharArray sc.next() sc.next sc for (int i = 1; i < arr.length; i++) {
			if (arr[i] == arr[i - 1]) {
				System.out.println("Bad");
				return;
			}
		} int i = 1; int i = 1; i 1 i < arr.length i arr.length arr arr.length i++ i++ i {
			if (arr[i] == arr[i - 1]) {
				System.out.println("Bad");
				return;
			}
		} {
			if (arr[i] == arr[i - 1]) {
				System.out.println("Bad");
				return;
			}
		} if (arr[i] == arr[i - 1]) {
				System.out.println("Bad");
				return;
			} arr[i] == arr[i - 1] arr[i] arr i arr[i - 1] arr 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);
		char[] arr = sc.next().toCharArray();
		for (int i = 1; i < arr.length; i++) {
			if (arr[i] == arr[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);
		char[] arr = sc.next().toCharArray();
		for (int i = 1; i < arr.length; i++) {
			if (arr[i] == arr[i - 1]) {
				System.out.println("Bad");
				return;
			}
		}
		System.out.println("Good");
	}
} Main
import java.util.*;

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