using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(RemoveCharacters("[this] is, (a) 'test'", new [] { "[", "]", "(", ")", "'", "," }));

    }

    private static string RemoveCharacters(string input, string[] specialCharactersToRemove)

    {

        foreach(string s in specialCharactersToRemove)

        {

            input = input.Replace(s, string.Empty);

        }

        return input;

    }

}