using System;

using System.IO;

using System.Threading;

using System.Text;

using System.Collections.Generic;

using System.Linq;

using System.Diagnostics;

using System.Collections.Concurrent;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        string[] palabras={"Hola","pepe","PePE","Amor","MAnolo","retraso"};

        ConcurrentDictionary<string, int> dici = new ConcurrentDictionary<string, int>();

        Parallel.ForEach(palabras, (p) =>        //Crea un hilo para cada proceso

        {

            if (dici.ContainsKey(p.ToLower()))

                dici[p.ToLower()]++;

            else

                dici.TryAdd(p.ToLower(), 1);

        });

        foreach (string p in dici.Keys)

        {

          Console.WriteLine("\nPalabra {0} veces:{1}.", p, dici[p]);

        }

    }

}