import java.lang.reflect.Array;
import java.util.*;
import java.io.*;
import java.lang.*;

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

        String s = sc.next();

        if (s.charAt(0)==s.charAt(1)|| s.charAt(1)==s.charAt(2)|| s.charAt(2)==s.charAt(3))
            System.out.println("Bad");
        else
            System.out.println("Good");
    }
} import java.lang.reflect.Array; Array java.lang.reflect import java.util.*; util.* java import java.io.*; io.* java import java.lang.*; lang.* java public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        String s = sc.next();

        if (s.charAt(0)==s.charAt(1)|| s.charAt(1)==s.charAt(2)|| s.charAt(2)==s.charAt(3))
            System.out.println("Bad");
        else
            System.out.println("Good");
    }
} Main public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        String s = sc.next();

        if (s.charAt(0)==s.charAt(1)|| s.charAt(1)==s.charAt(2)|| s.charAt(2)==s.charAt(3))
            System.out.println("Bad");
        else
            System.out.println("Good");
    } main {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();

        if (s.charAt(0)==s.charAt(1)|| s.charAt(1)==s.charAt(2)|| s.charAt(2)==s.charAt(3))
            System.out.println("Bad");
        else
            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 if (s.charAt(0)==s.charAt(1)|| s.charAt(1)==s.charAt(2)|| s.charAt(2)==s.charAt(3))
            System.out.println("Bad");
        else
            System.out.println("Good"); s.charAt(0)==s.charAt(1)|| s.charAt(1)==s.charAt(2)|| s.charAt(2)==s.charAt(3) s.charAt(0)==s.charAt(1)|| s.charAt(1)==s.charAt(2)|| s.charAt(2)==s.charAt(3) s.charAt(0)==s.charAt(1) s.charAt(0) s.charAt s 0 s.charAt(1) s.charAt s 1 s.charAt(1)==s.charAt(2) s.charAt(1) s.charAt s 1 s.charAt(2) s.charAt s 2 s.charAt(2)==s.charAt(3) s.charAt(2) s.charAt s 2 s.charAt(3) s.charAt s 3 System.out.println("Bad") System.out.println System.out System System.out "Bad" 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();

        if (s.charAt(0)==s.charAt(1)|| s.charAt(1)==s.charAt(2)|| s.charAt(2)==s.charAt(3))
            System.out.println("Bad");
        else
            System.out.println("Good");
    }
} public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        String s = sc.next();

        if (s.charAt(0)==s.charAt(1)|| s.charAt(1)==s.charAt(2)|| s.charAt(2)==s.charAt(3))
            System.out.println("Bad");
        else
            System.out.println("Good");
    }
} Main
import java.lang.reflect.Array;
import java.util.*;
import java.io.*;
import java.lang.*;

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

        String s = sc.next();

        if (s.charAt(0)==s.charAt(1)|| s.charAt(1)==s.charAt(2)|| s.charAt(2)==s.charAt(3))
            System.out.println("Bad");
        else
            System.out.println("Good");
    }
}
