import java.util.*;
public class Main{
    public static void main(String[]args){
        Scanner sc = new Scanner(System.in);

        String s = sc.next();


        for(int i = 1; i < s.length(); i++) {
            if (s.charAt(i - 1) == s.charAt(i)) {
                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);

        String s = sc.next();


        for(int i = 1; i < s.length(); i++) {
            if (s.charAt(i - 1) == s.charAt(i)) {
                System.out.println("Bad");
                return;
            }
        }
        System.out.println("Good");

    }
} Main public static void main(String[]args){
        Scanner sc = new Scanner(System.in);

        String s = sc.next();


        for(int i = 1; i < s.length(); i++) {
            if (s.charAt(i - 1) == s.charAt(i)) {
                System.out.println("Bad");
                return;
            }
        }
        System.out.println("Good");

    } main {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();


        for(int i = 1; i < s.length(); i++) {
            if (s.charAt(i - 1) == s.charAt(i)) {
                System.out.println("Bad");
                return;
            }
        }
        System.out.println("Good");

    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc for(int i = 1; i < s.length(); i++) {
            if (s.charAt(i - 1) == s.charAt(i)) {
                System.out.println("Bad");
                return;
            }
        } int i = 1; int i = 1; i 1 i < s.length() i s.length() s.length s i++ i++ i {
            if (s.charAt(i - 1) == s.charAt(i)) {
                System.out.println("Bad");
                return;
            }
        } {
            if (s.charAt(i - 1) == s.charAt(i)) {
                System.out.println("Bad");
                return;
            }
        } if (s.charAt(i - 1) == s.charAt(i)) {
                System.out.println("Bad");
                return;
            } s.charAt(i - 1) == s.charAt(i) s.charAt(i - 1) s.charAt s i - 1 i 1 s.charAt(i) s.charAt s i {
                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);

        String s = sc.next();


        for(int i = 1; i < s.length(); i++) {
            if (s.charAt(i - 1) == s.charAt(i)) {
                System.out.println("Bad");
                return;
            }
        }
        System.out.println("Good");

    }
} public class Main{
    public static void main(String[]args){
        Scanner sc = new Scanner(System.in);

        String s = sc.next();


        for(int i = 1; i < s.length(); i++) {
            if (s.charAt(i - 1) == s.charAt(i)) {
                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);

        String s = sc.next();


        for(int i = 1; i < s.length(); i++) {
            if (s.charAt(i - 1) == s.charAt(i)) {
                System.out.println("Bad");
                return;
            }
        }
        System.out.println("Good");

    }
}