using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string s = "16C-ACC";

        string r1 = Regex.Replace(s, @"\W+", "");

        string r2 = Regex.Replace(s, "[^A-Za-z0-9]", "");

        Console.WriteLine(r1);

        Console.WriteLine(r1 == "16CACC");

        Console.WriteLine(r2);

        Console.WriteLine(r2 == "16CACC");

    }

}