import java.util.*;

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

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