using System;

public class Program

{

    public static void Main()

    {

        Sentence s = new Sentence();

        Console.WriteLine(s[8]);

    }

​

    public class Sentence 

    {   

        string[] word = "con trai ma khong co su nghiep con gai no choi xong no bo".Split();

    public string this [int wordNum]

    {

        get { return word [wordNum];}

        set { word [wordNum] = value;}

    }

    }

}