import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		String s=scan.next();
		int c=0;
		for(int i=0;i<s.length()-1;i++)
		{
			if(s.charAt(i)==s.charAt(i+1))
			{
				c=1;
			}
		}
		if(c==1)System.out.println("Bad");
		else System.out.println("Good");

	}

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

	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		String s=scan.next();
		int c=0;
		for(int i=0;i<s.length()-1;i++)
		{
			if(s.charAt(i)==s.charAt(i+1))
			{
				c=1;
			}
		}
		if(c==1)System.out.println("Bad");
		else System.out.println("Good");

	}

} Main public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		String s=scan.next();
		int c=0;
		for(int i=0;i<s.length()-1;i++)
		{
			if(s.charAt(i)==s.charAt(i+1))
			{
				c=1;
			}
		}
		if(c==1)System.out.println("Bad");
		else System.out.println("Good");

	} main {
		Scanner scan= new Scanner(System.in);
		String s=scan.next();
		int c=0;
		for(int i=0;i<s.length()-1;i++)
		{
			if(s.charAt(i)==s.charAt(i+1))
			{
				c=1;
			}
		}
		if(c==1)System.out.println("Bad");
		else System.out.println("Good");

	} Scanner scan= new Scanner(System.in); scan new Scanner(System.in) String s=scan.next(); s scan.next() scan.next scan int c=0; c 0 for(int i=0;i<s.length()-1;i++)
		{
			if(s.charAt(i)==s.charAt(i+1))
			{
				c=1;
			}
		} int i=0; int i=0; i 0 i<s.length()-1 i s.length()-1 s.length() s.length s 1 i++ i++ i {
			if(s.charAt(i)==s.charAt(i+1))
			{
				c=1;
			}
		} {
			if(s.charAt(i)==s.charAt(i+1))
			{
				c=1;
			}
		} if(s.charAt(i)==s.charAt(i+1))
			{
				c=1;
			} 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 {
				c=1;
			} c=1 c 1 if(c==1)System.out.println("Bad");
		else System.out.println("Good"); c==1 c 1 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 scan= new Scanner(System.in);
		String s=scan.next();
		int c=0;
		for(int i=0;i<s.length()-1;i++)
		{
			if(s.charAt(i)==s.charAt(i+1))
			{
				c=1;
			}
		}
		if(c==1)System.out.println("Bad");
		else System.out.println("Good");

	}

} public class Main {

	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		String s=scan.next();
		int c=0;
		for(int i=0;i<s.length()-1;i++)
		{
			if(s.charAt(i)==s.charAt(i+1))
			{
				c=1;
			}
		}
		if(c==1)System.out.println("Bad");
		else System.out.println("Good");

	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan= new Scanner(System.in);
		String s=scan.next();
		int c=0;
		for(int i=0;i<s.length()-1;i++)
		{
			if(s.charAt(i)==s.charAt(i+1))
			{
				c=1;
			}
		}
		if(c==1)System.out.println("Bad");
		else System.out.println("Good");

	}

}
