using static System.Console;
using System.Globalization;
public class TestClassifiedAd
{
   public static void Main()
   {
    ClassifiedAd myClassifiedAd = new ClassifiedAd();
    ClassifiedAd yourClassifiedAd = new ClassifiedAd();
    myClassifiedAd.Category = "used cars";
    myClassifiedAd.Words = 100;
    yourClassifiedAd.Category = "Help Wanted";
    yourClassifiedAd.Words = 60;
    WriteLine("The classified ad with {0} words in category {1} costs {2}", myClassifiedAd.Words, myClassifiedAd.Category, myClassifiedAd.price.ToString("C",CultureInfo.GetCultureInfo("en-US")));

WriteLine("The classified ad with {0} words in category {1} costs {2}", yourClassifiedAd.Words, yourClassifiedAd.Category, yourClassifiedAd.price.ToString("C",CultureInfo.GetCultureInfo("en-US")));
   }
}
class ClassifiedAd
{
    const double PRICE_PER_WORD = 0.09;
    public int words;
    public double price;
    public string Category {get;set;}
    public int Words
    {
      get
      {
        return words;
      }
      set
      {
        words = value;
        price = words * PRICE_PER_WORD;
      }
    }
}