Progr Fundamentals - Lists - 05. Array Manipulator

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

namespace _06b_Lists_Exercises
{
    class Lists_Exercises
    {
      static void Main(string[] args)
        {
            List<int> numList = Console.ReadLine().Split(' ').Select(int.Parse).ToList();
            List<string> commands = Console.ReadLine().Split(' ').ToList();

            while (commands[0] != "print")
            {
                if (commands[0] == "add")
                {
                    numList.Insert(int.Parse(commands[1]), int.Parse(commands[2]));
                }
                else if (commands[0] == "addMany")
                {
                    int index = int.Parse(commands[1]);
                    numList.InsertRange(index, commands.Skip(2).Select(int.Parse));
                }
                else if (commands[0] == "contains")
                {
                    if (numList.Contains(int.Parse(commands[1])))
                    {
                        Console.WriteLine(numList.IndexOf(int.Parse(commands[1])));
                    }
                    else
                    {
                        Console.WriteLine(-1);
                    }
                }
                else if (commands[0] == "remove")
                {
                    numList.RemoveAt(int.Parse(commands[1]));
                }
                else if (commands[0] == "shift")
                {
                    int position = int.Parse(commands[1]) % numList.Count;
                    var helper = numList.Skip(position).ToList();
                    for (int i = 0; i < position; i++)
                    {
                        helper.Add(numList[i]);
                    }
                    numList = helper;
                }
                else if (commands[0] == "sumPairs")
                {
                    int cycles = numList.Count / 2;
                    for (int i = 0; i < cycles; i++)
                    {
                        numList[i] += numList[i + 1];
                        numList.RemoveAt(i + 1);
                    }
                }
                commands = Console.ReadLine().Split(new char[] { ' ' }).ToList();

            }
            Console.WriteLine("[" + string.Join(", ", numList) + "]");
        }
    }
}