import java.util.Scanner;

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

        for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                System.out.println("Bad");
                return;
            }
        }
        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();

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

        for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                System.out.println("Bad");
                return;
            }
        }
        System.out.println("Good");
    } main {
        Scanner scan = new Scanner(System.in);
        String s = scan.next();

        for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                System.out.println("Bad");
                return;
            }
        }
        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 for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                System.out.println("Bad");
                return;
            }
        } int i = 0; int i = 0; i 0 i < 3 i 3 i++ i++ i {
            if (s.charAt(i) == s.charAt(i + 1)) {
                System.out.println("Bad");
                return;
            }
        } {
            if (s.charAt(i) == s.charAt(i + 1)) {
                System.out.println("Bad");
                return;
            }
        } if (s.charAt(i) == s.charAt(i + 1)) {
                System.out.println("Bad");
                return;
            } 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 {
                System.out.println("Bad");
                return;
            } System.out.println("Bad") System.out.println System.out System System.out "Bad" return; 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();

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

        for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                System.out.println("Bad");
                return;
            }
        }
        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();

        for (int i = 0; i < 3; i++) {
            if (s.charAt(i) == s.charAt(i + 1)) {
                System.out.println("Bad");
                return;
            }
        }
        System.out.println("Good");
    }
}