asd

using System;
using System.Collections.Generic;
using System.Threading;
using System.Linq;

namespace ConsoleApp26
{
    class Program
    {
        static void Main(string[] args)
        {
            string simbol;
            List<string> text;
            char[] separator = { ' ', '.', ',' };

            if (args.Length > 0)
            {
                text = args[0].Split(separator).ToList();
                Console.Write("Текст: ");

                foreach (string item in text)
                {
                    Console.Write(item + " ");
                }
                Console.WriteLine();
                simbol = args.Last();
                Console.WriteLine($"буква: {simbol}");
                Console.Write("Результат: ");

                foreach (string word in text)
                {
                    if (word.ToLower().StartsWith(simbol))
                    {
                        Console.Write(word.Replace(",","").Replace(".","") + " ");
                    }
                }
            }
            else
            {
                Console.WriteLine("Отсуствуют аргменты");
            }
            Console.ReadKey();
        }
    }
}