PredicateParty!

namespace PredicateParty
{
    using System;
    using System.Collections.Generic;
    using System.Linq;

    public static class Functions
    {
        public static readonly Action<List<string>, string, Func<string, string, bool>> Remove = (l, m, f) =>
                               {
                                   for (int currElement = 0; currElement < l.Count; currElement++)
                                   {
                                       if (f(l[currElement], m))
                                       {
                                           l.RemoveAt(currElement);
                                           currElement--;
                                       }
                                   }
                               };

        public static readonly Action<List<string>, string, Func<string, string, bool>> Double = (l, m, f) =>
                               {
                                   for (int currElement = 0; currElement < l.Count; currElement++)
                                   {
                                       if (f(l[currElement], m))
                                       {
                                           l.Insert(currElement, l[currElement]);
                                           currElement++;
                                       }
                                   }
                               };

        public static readonly Func<string, string, bool> StartsWith = (f, s)
                                                => f.Substring(0, s.Length) == s;

        public static readonly Func<string, string, bool> EndsWith = (f, s)
                                                => f.Substring(f.Length - s.Length, s.Length) == s;

        public static readonly Func<string, string, bool> HasLenght = (f, s)
                                                => f.Length == s.Length;
    }

    public class PredicateParty
    {
        public static void Main()
        {
            List<string> names = SplitString(Console.ReadLine()).ToList();

            string inputLine = Console.ReadLine();
            while (inputLine != "Party!")
            {
                string[] commandInfo = SplitString(inputLine);

                string guestCommand = commandInfo[0];
                string command = commandInfo[1];
                string toMatch = string.Empty;

                if (guestCommand == "Remove")
                {
                    if (command == "StartsWith")
                    {
                        toMatch = commandInfo[2];

                        Functions.Remove(names, toMatch, Functions.StartsWith);
                    }
                    else if (command == "EndsWith")
                    {
                        toMatch = commandInfo[2];

                        Functions.Remove(names, toMatch, Functions.EndsWith);
                    }
                    else if (command == "Length")
                    {
                        toMatch = new string(' ', int.Parse(commandInfo[2]));

                        Functions.Remove(names, toMatch, Functions.HasLenght);
                    }
                }
                else if (guestCommand == "Double")
                {
                    if (command == "StartsWith")
                    {
                        toMatch = commandInfo[2];

                        Functions.Double(names, toMatch, Functions.StartsWith);
                    }
                    else if (command == "EndsWith")
                    {
                        toMatch = commandInfo[2];

                        Functions.Double(names, toMatch, Functions.EndsWith);
                    }
                    else if (command == "Length")
                    {
                        toMatch = new string(' ', int.Parse(commandInfo[2]));

                        Functions.Double(names, toMatch, Functions.HasLenght);
                    }
                }

                inputLine = Console.ReadLine();
            }

            string result = names.Count == 0 ? "Nobody is" : $"{string.Join(", ", names)} are";
            Console.WriteLine($"{result} going to the party!");
        }

        public static string[] SplitString(string toSplit)
        {
            return toSplit.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
        }
    }
}