import java.util.*;
public class Main{
  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    String str = sc.next();
    char[] data = str.toCharArray();


    if (data[0]==data[1]||data[1]==data[2]||data[2]==data[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 str = sc.next();
    char[] data = str.toCharArray();


    if (data[0]==data[1]||data[1]==data[2]||data[2]==data[3]) {
      System.out.println("Bad");
    } else {
      System.out.println("Good");
    }


  }
} Main public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    String str = sc.next();
    char[] data = str.toCharArray();


    if (data[0]==data[1]||data[1]==data[2]||data[2]==data[3]) {
      System.out.println("Bad");
    } else {
      System.out.println("Good");
    }


  } main {
    Scanner sc = new Scanner(System.in);
    String str = sc.next();
    char[] data = str.toCharArray();


    if (data[0]==data[1]||data[1]==data[2]||data[2]==data[3]) {
      System.out.println("Bad");
    } else {
      System.out.println("Good");
    }


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


    if (data[0]==data[1]||data[1]==data[2]||data[2]==data[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 str = sc.next();
    char[] data = str.toCharArray();


    if (data[0]==data[1]||data[1]==data[2]||data[2]==data[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 str = sc.next();
    char[] data = str.toCharArray();


    if (data[0]==data[1]||data[1]==data[2]||data[2]==data[3]) {
      System.out.println("Bad");
    } else {
      System.out.println("Good");
    }


  }
}
