using System;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		var s="This123$is'a-test";
        var t=Regex.Split(s, @"(?<=[a-zA-Z])(?=[^a-zA-Z])|(?<=[^a-zA-Z])(?=[a-zA-Z])");
        foreach(var a in t) {
            Console.WriteLine("'{0}'", a);
        }
	}
}