import java.util.Scanner;

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