import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String answer = "Good";
        for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                answer = "Bad";
                break;
            }
        }
        System.out.println(answer);
        sc.close();
    }
} 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();
        String answer = "Good";
        for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                answer = "Bad";
                break;
            }
        }
        System.out.println(answer);
        sc.close();
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String answer = "Good";
        for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                answer = "Bad";
                break;
            }
        }
        System.out.println(answer);
        sc.close();
    } main {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String answer = "Good";
        for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                answer = "Bad";
                break;
            }
        }
        System.out.println(answer);
        sc.close();
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc String answer = "Good"; answer "Good" for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                answer = "Bad";
                break;
            }
        } int i = 0; int i = 0; i 0 i < 3 i 3 i++ i++ i {
            if (s.charAt(i) == s.charAt(i + 1)) {
                answer = "Bad";
                break;
            }
        } {
            if (s.charAt(i) == s.charAt(i + 1)) {
                answer = "Bad";
                break;
            }
        } if (s.charAt(i) == s.charAt(i + 1)) {
                answer = "Bad";
                break;
            } 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 {
                answer = "Bad";
                break;
            } answer = "Bad" answer "Bad" break; System.out.println(answer) System.out.println System.out System System.out answer sc.close() sc.close sc String[] args args public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String answer = "Good";
        for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                answer = "Bad";
                break;
            }
        }
        System.out.println(answer);
        sc.close();
    }
} public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String answer = "Good";
        for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                answer = "Bad";
                break;
            }
        }
        System.out.println(answer);
        sc.close();
    }
} Main
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String answer = "Good";
        for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                answer = "Bad";
                break;
            }
        }
        System.out.println(answer);
        sc.close();
    }
}