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

    String S = sc.next();

    char[] s = S.toCharArray();
    
    boolean flag = false;
    
    for(int i = 0 ; i < 3 ; i++){
      if(s[i]==s[i+1]){
        flag = true;
        break;
      }
    }
    
    if(flag){
      System.out.println("Bad");
    }else{
      System.out.println("Good");
    }
    
  }
} 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();

    char[] s = S.toCharArray();
    
    boolean flag = false;
    
    for(int i = 0 ; i < 3 ; i++){
      if(s[i]==s[i+1]){
        flag = true;
        break;
      }
    }
    
    if(flag){
      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();

    char[] s = S.toCharArray();
    
    boolean flag = false;
    
    for(int i = 0 ; i < 3 ; i++){
      if(s[i]==s[i+1]){
        flag = true;
        break;
      }
    }
    
    if(flag){
      System.out.println("Bad");
    }else{
      System.out.println("Good");
    }
    
  } main {
 
    Scanner sc = new Scanner ( System.in );

    String S = sc.next();

    char[] s = S.toCharArray();
    
    boolean flag = false;
    
    for(int i = 0 ; i < 3 ; i++){
      if(s[i]==s[i+1]){
        flag = true;
        break;
      }
    }
    
    if(flag){
      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 char[] s = S.toCharArray(); s S.toCharArray() S.toCharArray S boolean flag = false; flag false for(int i = 0 ; i < 3 ; i++){
      if(s[i]==s[i+1]){
        flag = true;
        break;
      }
    } int i = 0 ; int i = 0 ; i 0 i < 3 i 3 i++ i++ i {
      if(s[i]==s[i+1]){
        flag = true;
        break;
      }
    } {
      if(s[i]==s[i+1]){
        flag = true;
        break;
      }
    } if(s[i]==s[i+1]){
        flag = true;
        break;
      } s[i]==s[i+1] s[i] s i s[i+1] s i+1 i 1 {
        flag = true;
        break;
      } flag = true flag true break; if(flag){
      System.out.println("Bad");
    }else{
      System.out.println("Good");
    } flag {
      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();

    char[] s = S.toCharArray();
    
    boolean flag = false;
    
    for(int i = 0 ; i < 3 ; i++){
      if(s[i]==s[i+1]){
        flag = true;
        break;
      }
    }
    
    if(flag){
      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();

    char[] s = S.toCharArray();
    
    boolean flag = false;
    
    for(int i = 0 ; i < 3 ; i++){
      if(s[i]==s[i+1]){
        flag = true;
        break;
      }
    }
    
    if(flag){
      System.out.println("Bad");
    }else{
      System.out.println("Good");
    }
    
  }
} Main
import java.util.Scanner;
 
public class Main {
  public static void main ( String[] args ) {
 
    Scanner sc = new Scanner ( System.in );

    String S = sc.next();

    char[] s = S.toCharArray();
    
    boolean flag = false;
    
    for(int i = 0 ; i < 3 ; i++){
      if(s[i]==s[i+1]){
        flag = true;
        break;
      }
    }
    
    if(flag){
      System.out.println("Bad");
    }else{
      System.out.println("Good");
    }
    
  }
}