07. List Manipulation Advanced

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

namespace ListManipulationAdvanced
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> num = Console.ReadLine()
                .Split()
                .Select(int.Parse)
                .ToList();

            string[] tokens = Console.ReadLine().Split();
            bool isCharged = false;

            while (tokens[0].ToLower() != "end")
            {
                switch (tokens[0].ToLower())
                {
                    case "add":
                        int numToAdd = int.Parse(tokens[1]);
                        num.Add(numToAdd);
                        isCharged = true;
                        break;
                    case "remove":
                        int numToRemove = int.Parse(tokens[1]);
                        num.Remove(numToRemove);
                        isCharged = true;
                        break;
                    case "removeat":
                        int indexToRemoveAt = int.Parse(tokens[1]);
                        num.RemoveAt(indexToRemoveAt);
                        isCharged = true;
                        break;
                    case "insert":
                        int numToInsert = int.Parse(tokens[1]);
                        int indexToInsert = int.Parse(tokens[2]);
                        num.Insert(indexToInsert, numToInsert);
                        isCharged = true;
                        break;
                    case "contains":
                        Console.WriteLine(num.Contains(int.Parse(tokens[1])) ? "Yes" : "No such number");
                        break;
                    case "printeven":
                        Console.WriteLine(string.Join(" ", num.Where(n => n % 2 == 0)));
                        break;
                    case "printodd":
                        Console.WriteLine(string.Join(" ", num.Where(n => n % 2 == 1)));
                        break;
                    case "getsum":
                        Console.WriteLine(num.Sum());
                        break;
                    case "filter":

                        if (tokens[1] == "<")
                        {
                            Console.WriteLine(string.Join(" ", num.Where(n => n < int.Parse(tokens[2]))));
                        }
                        else if (tokens[1] == ">")
                        {
                            Console.WriteLine(string.Join(" ", num.Where(n => n > int.Parse(tokens[2]))));
                        }
                        else if (tokens[1] == "<=")
                        {
                            Console.WriteLine(string.Join(" ", num.Where(n => n <= int.Parse(tokens[2]))));
                        }
                        else if (tokens[1] == ">=")
                        {
                            Console.WriteLine(string.Join(" ", num.Where(n => n >= int.Parse(tokens[2]))));
                        }
                        break;
                }

                tokens = Console.ReadLine().Split();
            }
            if (isCharged)
            {
                Console.WriteLine(string.Join(" ", num));
            }
        }
    }
}