import java.util.*;

public class Main {

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

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

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

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

public class Main {

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