List Manipulation Advanced

using System;
using System.Linq;
using System.Collections.Generic;
namespace ConsoleApp47
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> numbers = Console.ReadLine().Split(" ").Select(int.Parse).ToList();
            bool smth = false;
            while (true)
            {
                string command = Console.ReadLine();
                if (command == "end")
                {
                    break;
                }
                string[] tokens = command.Split(" ");
                if (tokens[0] == "Add")
                {
                    int number = int.Parse(tokens[1]);
                    numbers.Add(number);
                    smth = true;
                }
                else if (tokens[0] == "Remove")
                {
                    int number = int.Parse(tokens[1]);
                    numbers.Remove(number);
                    smth = true;
                }
                else if (tokens[0] == "RemoveAt")
                {
                    int number = int.Parse(tokens[1]);
                    numbers.RemoveAt(number);
                    smth = true;
                }
                else if (tokens[0] == "Insert")
                {
                    int number = int.Parse(tokens[1]);
                    int secondNumber = int.Parse(tokens[2]);
                    numbers.Insert(secondNumber, number);
                    smth = true;
                }
                else if (tokens[0] == "Contains")
                {
                    int number = int.Parse(tokens[1]);
                    bool check = numbers.Contains(number);
                    if (check == true)
                    {
                        Console.WriteLine("Yes");
                    }
                    else
                    {
                        Console.WriteLine("No such number");
                    }
                }
                else if (tokens[0] == "PrintEven")
                {
                    for (int i = 0; i < numbers.Count - 1; i++)
                    {
                        if (numbers[i] % 2 == 0)
                        {
                            Console.Write(numbers[i] + " ");
                        }
                    }
                    Console.WriteLine();
                }
                else if (tokens[0] == "PrintOdd")
                {
                    for (int i = 0; i < numbers.Count; i++)
                    {
                        if (numbers[i] % 2 != 0)
                        {
                            Console.Write(numbers[i] + " ");
                        }
                    }
                    Console.WriteLine();
                }
                else if (tokens[0] == "GetSum")
                {
                    int sum = 0;
                    for (int i = 0; i < numbers.Count; i++)
                    {
                        sum += numbers[i];
                    }
                    Console.WriteLine(sum);
                }
                else if (tokens[0] == "Filter")
                {
                    if (tokens[1] == "<")
                    {
                        for (int i = 0; i < numbers.Count - 1; i++)
                        {
                            int number = int.Parse(tokens[2]);
                            if (numbers[i] < number)
                            {
                                Console.Write(numbers[i] + " ");
                            }
                        }
                        Console.WriteLine();
                    }
                    else if (tokens[1] == ">")
                    {
                        for (int i = 0; i < numbers.Count - 1; i++)
                        {
                            int number = int.Parse(tokens[2]);
                            if (numbers[i] > number)
                            {
                                Console.Write(numbers[i] + " ");
                            }
                        }
                        Console.WriteLine();
                    }
                    else if (tokens[1] == ">=")
                    {
                        for (int i = 0; i < numbers.Count; i++)
                        {
                            int number = int.Parse(tokens[2]);
                            if (numbers[i] >= number)
                            {
                                Console.Write(numbers[i] + " ");
                            }
                        }
                        Console.WriteLine();
                    }
                    else if (tokens[1] == "<=")
                    {
                        for (int i = 0; i < numbers.Count; i++)
                        {
                            int number = int.Parse(tokens[2]);
                            if (numbers[i] <= number)
                            {
                                Console.Write(numbers[i] + " ");
                            }
                        }
                        Console.WriteLine();
                    }
                }
            }
            if (smth == true)
            {
                Console.WriteLine(string.Join (" ", numbers));
            }

        }
    }
}