
import java.util.Scanner;

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

        char[] S = scanner.next().toCharArray();
        if (S[0] == S[1] || S[1] == S[2] || S[2] == S[3]) {
            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 scanner = new Scanner(System.in);

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

        char[] S = scanner.next().toCharArray();
        if (S[0] == S[1] || S[1] == S[2] || S[2] == S[3]) {
            System.out.println("Bad");
        } else {
            System.out.println("Good");
        }
    } main {
        Scanner scanner = new Scanner(System.in);

        char[] S = scanner.next().toCharArray();
        if (S[0] == S[1] || S[1] == S[2] || S[2] == S[3]) {
            System.out.println("Bad");
        } else {
            System.out.println("Good");
        }
    } Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) char[] S = scanner.next().toCharArray(); S scanner.next().toCharArray() scanner.next().toCharArray scanner.next() scanner.next scanner if (S[0] == S[1] || S[1] == S[2] || S[2] == S[3]) {
            System.out.println("Bad");
        } else {
            System.out.println("Good");
        } S[0] == S[1] || S[1] == S[2] || S[2] == S[3] S[0] == S[1] || S[1] == S[2] || S[2] == S[3] S[0] == S[1] S[0] S 0 S[1] S 1 S[1] == S[2] S[1] S 1 S[2] S 2 S[2] == S[3] S[2] S 2 S[3] S 3 {
            System.out.println("Bad");
        } System.out.println("Bad") System.out.println System.out System System.out "Bad" {
            System.out.println("Good");
        } 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 scanner = new Scanner(System.in);

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

        char[] S = scanner.next().toCharArray();
        if (S[0] == S[1] || S[1] == S[2] || S[2] == S[3]) {
            System.out.println("Bad");
        } else {
            System.out.println("Good");
        }
    }
} Main

import java.util.Scanner;

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

        char[] S = scanner.next().toCharArray();
        if (S[0] == S[1] || S[1] == S[2] || S[2] == S[3]) {
            System.out.println("Bad");
        } else {
            System.out.println("Good");
        }
    }
}
