Numbers

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace ExamProblemThree
{
    internal class Program
    {
        static void Main(string[] args)
        {
           List<int> numbers = Console.ReadLine()
                .Split(' ',StringSplitOptions.RemoveEmptyEntries)
                .Select(int.Parse)
                .ToList();

            string[] command = Console.ReadLine()
                .Split(' ',StringSplitOptions.RemoveEmptyEntries);

            while (command[0] != "Finish")
            {
                switch (command[0])
                {
                    case "Add":
                        numbers.Add(int.Parse(command[1]));
                        break;
                    case "Remove":
                        if (numbers.Contains(int.Parse(command[1])))
                        {
                            numbers.Remove(int.Parse(command[1]));
                        }
                        break;
                    case "Replace":
                        if (numbers.Contains(int.Parse(command[1])))
                        {
                            for (int i = 0; i < numbers.Count; i++)
                            {
                                if (numbers[i] == int.Parse(command[1]))
                                {
                                    numbers[i] = int.Parse(command[2]);
                                }
                            }
                        }
                        break;
                    case "Collapse":
                        for (int i = 0; i < numbers.Count; i++)
                        {
                            if (numbers[i] < int.Parse(command[1]))
                            {
                                numbers.Remove(numbers[i]);
                            }
                        }
                        break;
                }
                command = Console.ReadLine().Split(' ', StringSplitOptions.RemoveEmptyEntries);
            }
            Console.WriteLine(string.Join(' ',numbers));
        }
    }
}