import java.util.*;
public class Main{
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    int x = 0;
    for(int i=1 ; i<4 ; i++){
      if(s.charAt(i)==s.charAt(i-1)){
        x = 1;
      }
    }
    if(x==1){
      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();
    int x = 0;
    for(int i=1 ; i<4 ; i++){
      if(s.charAt(i)==s.charAt(i-1)){
        x = 1;
      }
    }
    if(x==1){
      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();
    int x = 0;
    for(int i=1 ; i<4 ; i++){
      if(s.charAt(i)==s.charAt(i-1)){
        x = 1;
      }
    }
    if(x==1){
      System.out.println("Bad");
    }else{
      System.out.println("Good");
    }
  } main {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    int x = 0;
    for(int i=1 ; i<4 ; i++){
      if(s.charAt(i)==s.charAt(i-1)){
        x = 1;
      }
    }
    if(x==1){
      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 int x = 0; x 0 for(int i=1 ; i<4 ; i++){
      if(s.charAt(i)==s.charAt(i-1)){
        x = 1;
      }
    } int i=1 ; int i=1 ; i 1 i<4 i 4 i++ i++ i {
      if(s.charAt(i)==s.charAt(i-1)){
        x = 1;
      }
    } {
      if(s.charAt(i)==s.charAt(i-1)){
        x = 1;
      }
    } if(s.charAt(i)==s.charAt(i-1)){
        x = 1;
      } 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 {
        x = 1;
      } x = 1 x 1 if(x==1){
      System.out.println("Bad");
    }else{
      System.out.println("Good");
    } x==1 x 1 {
      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();
    int x = 0;
    for(int i=1 ; i<4 ; i++){
      if(s.charAt(i)==s.charAt(i-1)){
        x = 1;
      }
    }
    if(x==1){
      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();
    int x = 0;
    for(int i=1 ; i<4 ; i++){
      if(s.charAt(i)==s.charAt(i-1)){
        x = 1;
      }
    }
    if(x==1){
      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();
    int x = 0;
    for(int i=1 ; i<4 ; i++){
      if(s.charAt(i)==s.charAt(i-1)){
        x = 1;
      }
    }
    if(x==1){
      System.out.println("Bad");
    }else{
      System.out.println("Good");
    }
  }
}
