import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String[] str = sc.next().split("");

        String result = "Good";
        if (str[0].equals(str[1]) || str[1].equals(str[2]) || str[2].equals(str[3])) {
          	result = "Bad";
        }
        
        System.out.println(result);
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String[] str = sc.next().split("");

        String result = "Good";
        if (str[0].equals(str[1]) || str[1].equals(str[2]) || str[2].equals(str[3])) {
          	result = "Bad";
        }
        
        System.out.println(result);
    }
} Main public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String[] str = sc.next().split("");

        String result = "Good";
        if (str[0].equals(str[1]) || str[1].equals(str[2]) || str[2].equals(str[3])) {
          	result = "Bad";
        }
        
        System.out.println(result);
    } main {
        Scanner sc = new Scanner(System.in);
        String[] str = sc.next().split("");

        String result = "Good";
        if (str[0].equals(str[1]) || str[1].equals(str[2]) || str[2].equals(str[3])) {
          	result = "Bad";
        }
        
        System.out.println(result);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String[] str = sc.next().split(""); str sc.next().split("") sc.next().split sc.next() sc.next sc "" String result = "Good"; result "Good" if (str[0].equals(str[1]) || str[1].equals(str[2]) || str[2].equals(str[3])) {
          	result = "Bad";
        } str[0].equals(str[1]) || str[1].equals(str[2]) || str[2].equals(str[3]) str[0].equals(str[1]) || str[1].equals(str[2]) || str[2].equals(str[3]) str[0].equals(str[1]) str[0].equals str[0] str 0 str[1] str 1 str[1].equals(str[2]) str[1].equals str[1] str 1 str[2] str 2 str[2].equals(str[3]) str[2].equals str[2] str 2 str[3] str 3 {
          	result = "Bad";
        } result = "Bad" result "Bad" System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String[] str = sc.next().split("");

        String result = "Good";
        if (str[0].equals(str[1]) || str[1].equals(str[2]) || str[2].equals(str[3])) {
          	result = "Bad";
        }
        
        System.out.println(result);
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String[] str = sc.next().split("");

        String result = "Good";
        if (str[0].equals(str[1]) || str[1].equals(str[2]) || str[2].equals(str[3])) {
          	result = "Bad";
        }
        
        System.out.println(result);
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String[] str = sc.next().split("");

        String result = "Good";
        if (str[0].equals(str[1]) || str[1].equals(str[2]) || str[2].equals(str[3])) {
          	result = "Bad";
        }
        
        System.out.println(result);
    }
}
