import java.util.*;

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

class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    boolean good = true;
    
    for (int i=0;i<S.length()-1;i++){
     if (S.charAt(i) == S.charAt(i+1)){
       good = false;
     }
    }
    if (good){
      System.out.println("Good");
    }else{
      System.out.println("Bad");
    }
  }
}