import java.util.Scanner;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    String ans = "Good";
    if(s.charAt(0) == s.charAt(1)
        | s.charAt(1) == s.charAt(2)
        | s.charAt(2) == s.charAt(3)) {
      ans = "Bad";
    }
      System.out.println(ans);
  }
} import java.util.Scanner; Scanner java.util public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    String ans = "Good";
    if(s.charAt(0) == s.charAt(1)
        | s.charAt(1) == s.charAt(2)
        | s.charAt(2) == s.charAt(3)) {
      ans = "Bad";
    }
      System.out.println(ans);
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    String ans = "Good";
    if(s.charAt(0) == s.charAt(1)
        | s.charAt(1) == s.charAt(2)
        | s.charAt(2) == s.charAt(3)) {
      ans = "Bad";
    }
      System.out.println(ans);
  } main {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    String ans = "Good";
    if(s.charAt(0) == s.charAt(1)
        | s.charAt(1) == s.charAt(2)
        | s.charAt(2) == s.charAt(3)) {
      ans = "Bad";
    }
      System.out.println(ans);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc String ans = "Good"; ans "Good" if(s.charAt(0) == s.charAt(1)
        | s.charAt(1) == s.charAt(2)
        | s.charAt(2) == s.charAt(3)) {
      ans = "Bad";
    } s.charAt(0) == s.charAt(1)
        | s.charAt(1) == s.charAt(2)
        | s.charAt(2) == s.charAt(3) s.charAt(0) == s.charAt(1)
        | s.charAt(1) == s.charAt(2)
        | s.charAt(2) == s.charAt(3) s.charAt(0) == s.charAt(1) s.charAt(0) s.charAt s 0 s.charAt(1) s.charAt s 1 s.charAt(1) == s.charAt(2) s.charAt(1) s.charAt s 1 s.charAt(2) s.charAt s 2 s.charAt(2) == s.charAt(3) s.charAt(2) s.charAt s 2 s.charAt(3) s.charAt s 3 {
      ans = "Bad";
    } ans = "Bad" ans "Bad" System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    String ans = "Good";
    if(s.charAt(0) == s.charAt(1)
        | s.charAt(1) == s.charAt(2)
        | s.charAt(2) == s.charAt(3)) {
      ans = "Bad";
    }
      System.out.println(ans);
  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    String ans = "Good";
    if(s.charAt(0) == s.charAt(1)
        | s.charAt(1) == s.charAt(2)
        | s.charAt(2) == s.charAt(3)) {
      ans = "Bad";
    }
      System.out.println(ans);
  }
} Main
import java.util.Scanner;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    String ans = "Good";
    if(s.charAt(0) == s.charAt(1)
        | s.charAt(1) == s.charAt(2)
        | s.charAt(2) == s.charAt(3)) {
      ans = "Bad";
    }
      System.out.println(ans);
  }
}