pr03

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

class WordCount
{
    private static void Main()
    {
        var textWords = new List<string>();

        using (var rdr = new StreamReader("text.txt")) //located in bin/debug
        {
            string input;
            while ((input = rdr.ReadLine()) != null)
            {
                var wordPattern = @"\b[A-Za-z]+\b";
                var rgx = new Regex(wordPattern);
                MatchCollection matches = rgx.Matches(input);
                textWords.AddRange(matches.Cast<Match>()
                    .Select(x => x.Value.ToLower())
                    .ToList());
            }
        }

        var occurences = new Dictionary<string, int>();
        using (var rdr = new StreamReader("words.txt")) //located in bin/debug
        {
            string input;
            while ((input = rdr.ReadLine()) != null)
            {
                var count = textWords.Count(x => x == input);
                occurences.Add(input, count);
            }
        }

        using (var wtr = new StreamWriter("result.txt")) // should be created in bin/debug
        {
            occurences.OrderByDescending(x => x.Value)
                .ToList()
                .ForEach(x => wtr.WriteLine("{0} - {1}", x.Key, x.Value));
        }
    }
}