import java.util.Scanner;

public class Main{

    public static void main(String[] args) {
        Scanner sc = new Scanner(System. in);
        String password = sc.next();  
      
     // int n = sc.nextInt();
        String ans = "Good";

        for(int i = 0; i < 3; i++) {
            if (password.substring(i,i+1).equals(password.substring(i+1,i+2))) {
                ans = "Bad";
            }
//            System.out.println(password.substring(i,i+2));
        }

        System.out.println(ans);
    }

} import java.util.Scanner; Scanner java.util public class Main{

    public static void main(String[] args) {
        Scanner sc = new Scanner(System. in);
        String password = sc.next();  
      
     // int n = sc.nextInt();
        String ans = "Good";

        for(int i = 0; i < 3; i++) {
            if (password.substring(i,i+1).equals(password.substring(i+1,i+2))) {
                ans = "Bad";
            }
//            System.out.println(password.substring(i,i+2));
        }

        System.out.println(ans);
    }

} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System. in);
        String password = sc.next();  
      
     // int n = sc.nextInt();
        String ans = "Good";

        for(int i = 0; i < 3; i++) {
            if (password.substring(i,i+1).equals(password.substring(i+1,i+2))) {
                ans = "Bad";
            }
//            System.out.println(password.substring(i,i+2));
        }

        System.out.println(ans);
    } main {
        Scanner sc = new Scanner(System. in);
        String password = sc.next();  
      
     // int n = sc.nextInt();
        String ans = "Good";

        for(int i = 0; i < 3; i++) {
            if (password.substring(i,i+1).equals(password.substring(i+1,i+2))) {
                ans = "Bad";
            }
//            System.out.println(password.substring(i,i+2));
        }

        System.out.println(ans);
    } Scanner sc = new Scanner(System. in); sc new Scanner(System. in) String password = sc.next(); password sc.next() sc.next sc String ans = "Good"; ans "Good" for(int i = 0; i < 3; i++) {
            if (password.substring(i,i+1).equals(password.substring(i+1,i+2))) {
                ans = "Bad";
            }
//            System.out.println(password.substring(i,i+2));
        } int i = 0; int i = 0; i 0 i < 3 i 3 i++ i++ i {
            if (password.substring(i,i+1).equals(password.substring(i+1,i+2))) {
                ans = "Bad";
            }
//            System.out.println(password.substring(i,i+2));
        } {
            if (password.substring(i,i+1).equals(password.substring(i+1,i+2))) {
                ans = "Bad";
            }
//            System.out.println(password.substring(i,i+2));
        } if (password.substring(i,i+1).equals(password.substring(i+1,i+2))) {
                ans = "Bad";
            } password.substring(i,i+1).equals(password.substring(i+1,i+2)) password.substring(i,i+1).equals password.substring(i,i+1) password.substring password i i+1 i 1 password.substring(i+1,i+2) password.substring password i+1 i 1 i+2 i 2 {
                ans = "Bad";
            } ans = "Bad" ans "Bad" System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main{

    public static void main(String[] args) {
        Scanner sc = new Scanner(System. in);
        String password = sc.next();  
      
     // int n = sc.nextInt();
        String ans = "Good";

        for(int i = 0; i < 3; i++) {
            if (password.substring(i,i+1).equals(password.substring(i+1,i+2))) {
                ans = "Bad";
            }
//            System.out.println(password.substring(i,i+2));
        }

        System.out.println(ans);
    }

} public class Main{

    public static void main(String[] args) {
        Scanner sc = new Scanner(System. in);
        String password = sc.next();  
      
     // int n = sc.nextInt();
        String ans = "Good";

        for(int i = 0; i < 3; i++) {
            if (password.substring(i,i+1).equals(password.substring(i+1,i+2))) {
                ans = "Bad";
            }
//            System.out.println(password.substring(i,i+2));
        }

        System.out.println(ans);
    }

} Main
import java.util.Scanner;

public class Main{

    public static void main(String[] args) {
        Scanner sc = new Scanner(System. in);
        String password = sc.next();  
      
     // int n = sc.nextInt();
        String ans = "Good";

        for(int i = 0; i < 3; i++) {
            if (password.substring(i,i+1).equals(password.substring(i+1,i+2))) {
                ans = "Bad";
            }
//            System.out.println(password.substring(i,i+2));
        }

        System.out.println(ans);
    }

}