Command Interpreter

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

namespace ConsoleApplication22
{
    class Program
    {
        static string[] input;
        static void Main(string[] args)
        {
            input = Console.ReadLine().Split(' ').ToArray();
            string command = Console.ReadLine();
            while (command != "end")
            {
                string[] tokens = command.Split(' ');
                switch (tokens[0])
                {
                    case "reverse":
                        int start = int.Parse(tokens[2]);
                        int count = int.Parse(tokens[4]);
                        Reverse(start, count);
                        break;
                    case "sort":
                        int starts = int.Parse(tokens[2]);
                        int counts = int.Parse(tokens[4]);
                        Sort(starts, counts);
                        break;
                    case "rollLeft":
                        int numOfRotationLeft = int.Parse(tokens[1]);
                        RollLeft(numOfRotationLeft);
                        break;
                    case "rollRight":
                        int numOfRotationRight = int.Parse(tokens[1]);
                        RollRight(numOfRotationRight);
                        break;
                }
                command = Console.ReadLine();
            }
        }
        private static void RollLeft(int numOfRotationLeft)
        {
            for (int i = 0; i < numOfRotationLeft % input.Length; i++)
            {
                var temp = input[0];
                for (int j = 1; j < input.Length; j++)
                {
                    input[j - 1] = input[j];
                }
                input[input.Length - 1] = temp;
            }
            Console.WriteLine("[" + string.Join(", ", input) + "]");
        }
        private static void RollRight(int numOfRotationRight)
        {
            for (int i = 0; i < numOfRotationRight; i++)
            {
                var temp = input[input.Length - 1];
                for (int j = input.Length - 1; j >= 1; j--)
                {
                    input[j] = input[j - 1];
                }
                input[0] = temp;
            }
            Console.WriteLine("[" + string.Join(", ", input) + "]");
        }
        private static void Sort(int start, int count)
        {
            if (IsValid(start, count))
            {
                string[] str = input.Skip(start).Take(count).ToArray();
                Array.Sort(str);
                var num = new List<string>();
                for (int i = 0; i < input.Length - (input.Length - start); i++)
                    num.Add(input[i]);
                num.AddRange(str);
                for (int i = start + count; i < input.Length; i++)
                    num.Add(input[i]);
                Console.WriteLine("[" + string.Join(", ", num) + "]");
            }
        }
        private static void Reverse(int start, int count)
        {
            if (IsValid(start, count))
            {
                string[] str = input.Skip(start).Take(count).ToArray();
                Array.Reverse(str);
                var num = new List<string>();
                for (int i = 0; i < input.Length - (input.Length - start); i++)
                    num.Add(input[i]);
                num.AddRange(str);
                for (int i = start + count; i < input.Length; i++)
                    num.Add(input[i]);
                Console.WriteLine("[" + string.Join(", ", num) + "]");
            }
        }
        private static bool IsValid(int start, int count)
        {
            bool isInRange = start < input.Length && start >= 0;
            bool isValidCount = (start + count) <= input.Length && count >= 0;
            if (isInRange && isValidCount)
            {
                return true;
            }
            else
            {
                Console.WriteLine("Invalid input parameters.");
                return false;
            }
        }
    }
}