06. List Manipulation Basics

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

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

            while (true)
            {
                string line = Console.ReadLine().ToLower();

                if (line == "end")
                {
                    break;
                }

                string[] tokens = line.Split();

                switch (tokens[0])
                {
                    case "add":
                        int numToAdd = int.Parse(tokens[1]);
                        num.Add(numToAdd);
                        break;
                    case "remove":
                        int numToRemove = int.Parse(tokens[1]);
                        num.Remove(numToRemove);
                        break;
                    case "removeat":
                        int indexToRemoveAt = int.Parse(tokens[1]);
                        num.RemoveAt(indexToRemoveAt);
                        break;
                    case "insert":
                        int numToInsert = int.Parse(tokens[1]);
                        int indexToInsert = int.Parse(tokens[2]);
                        num.Insert(indexToInsert, numToInsert);
                        break;
                }
            }
            Console.WriteLine(string.Join(' ', num));

        }
    }
}