A small program to filter words

FilterWords.cs

using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;
using System.Text.RegularExpressions;

namespace FilterWords
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args == null || args.Length == 0)
            {
                Console.WriteLine("Please provide a path argument");
                return;
            }
            
            try
            {
                string path = args[0];
                Regex regex = new Regex(@"^[a-zA-Z]+$");
                var text = File.ReadAllText(path);
                var words = text.Split('\n').ToList();
                words = words.Where(w => w.Length >= 3 && regex.Match(w).Success).Select(w => w.ToLower()).Distinct().OrderBy(s => s).ToList();

                File.WriteAllText(path, String.Join('\n', words));
            }
            catch (xception ex)
            {
                Console.WriteLine(ex.Message);
            }            
        }
    }
}