using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        string str = "$50,550";

        decimal decval;

        bool convt = decimal.TryParse(str, NumberStyles.Currency, CultureInfo.InvariantCulture, out decval);

        if (convt) 

            Console.WriteLine(decval);

        else

            Console.WriteLine("error");

        Console.ReadLine();

    }

}