import java.util.Scanner;

public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		int count = 0;
				
		for (int i = 0; i < s.length() - 1; i++) {
			if (s.charAt(i) == s.charAt(i + 1)) {
				count++;
			}
		}
		
		System.out.println(count == 0 ? "Good" : "Bad");
	}	
} 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.next();
		int count = 0;
				
		for (int i = 0; i < s.length() - 1; i++) {
			if (s.charAt(i) == s.charAt(i + 1)) {
				count++;
			}
		}
		
		System.out.println(count == 0 ? "Good" : "Bad");
	}	
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		int count = 0;
				
		for (int i = 0; i < s.length() - 1; i++) {
			if (s.charAt(i) == s.charAt(i + 1)) {
				count++;
			}
		}
		
		System.out.println(count == 0 ? "Good" : "Bad");
	} main {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		int count = 0;
				
		for (int i = 0; i < s.length() - 1; i++) {
			if (s.charAt(i) == s.charAt(i + 1)) {
				count++;
			}
		}
		
		System.out.println(count == 0 ? "Good" : "Bad");
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc int count = 0; count 0 for (int i = 0; i < s.length() - 1; i++) {
			if (s.charAt(i) == s.charAt(i + 1)) {
				count++;
			}
		} 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)) {
				count++;
			}
		} {
			if (s.charAt(i) == s.charAt(i + 1)) {
				count++;
			}
		} if (s.charAt(i) == s.charAt(i + 1)) {
				count++;
			} 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 {
				count++;
			} count++ count System.out.println(count == 0 ? "Good" : "Bad") System.out.println System.out System System.out count == 0 ? "Good" : "Bad" count == 0 count 0 "Good" "Bad" String[] args args public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		int count = 0;
				
		for (int i = 0; i < s.length() - 1; i++) {
			if (s.charAt(i) == s.charAt(i + 1)) {
				count++;
			}
		}
		
		System.out.println(count == 0 ? "Good" : "Bad");
	}	
} public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		int count = 0;
				
		for (int i = 0; i < s.length() - 1; i++) {
			if (s.charAt(i) == s.charAt(i + 1)) {
				count++;
			}
		}
		
		System.out.println(count == 0 ? "Good" : "Bad");
	}	
} Main
import java.util.Scanner;

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