Command Interpreter

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


    class Program
    {
    static void Main(string[] args)
    {

        List<string> nums = Console.ReadLine().Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries).ToList();

        string command = "";
        while (true)
        {
            string[] input = Console.ReadLine().Split().ToArray();
            command = input[0];
            if (command == "end") break;
            else if (command == "reverse")
            {
                short start = short.Parse(input[2]);
                short count = short.Parse(input[4]);
                if (start < 0 || count < 0 || start >= nums.Count || count > nums.Count || start + count > nums.Count)
                {
                    Console.WriteLine("Invalid input parameters.");
                    continue;
                }
                string[] portion = new string[count];
                for (short i = 0; i < portion.Length; i++)
                {
                    portion[i] = nums[start + i];
                }
                Array.Reverse(portion);
                for (short i = start; i < start + count; i++)
                {
                    nums[i] = portion[i - start];
                }
            }
            else if (command == "sort")
            {
                short start = short.Parse(input[2]);
                short count = short.Parse(input[4]);
                if (start < 0 || count < 0 || start >= nums.Count || count > nums.Count || start + count > nums.Count)
                {
                    Console.WriteLine("Invalid input parameters.");
                    continue;
                }
                string[] portion = new string[count];
                for (short i = 0; i < portion.Length; i++)
                {
                    portion[i] = nums[start + i];
                }
                portion = portion.OrderBy(x => x).ToArray();
                for (short i = start; i < start + count; i++)
                {
                    nums[i] = portion[i - start];
                }
            }
            else if (command == "rollLeft")
            {
                int count = int.Parse(input[1]);
                if (count < 0)
                {
                    Console.WriteLine("Invalid input parameters.");
                    continue;
                }
                for (int i = 0; i < count % nums.Count; i++)
                {
                    string temp = nums[0];
                    nums.RemoveAt(0);
                    nums.Add(temp);
                }
            }
            else if (command == "rollRight")
            {
                int count = int.Parse(input[1]);
                if (count < 0)
                {
                    Console.WriteLine("Invalid input parameters.");
                    continue;
                }
                for (int i = 0; i < count%nums.Count; i++)
                {
                    string temp = nums[nums.Count - 1];
                    nums.RemoveAt(nums.Count - 1);
                    nums.Insert(0, temp);
                }
            }

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