Command interpreter

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

namespace _02.Command_interpreter
{
    class CommandInterpreter80points
    {
        static void Main(string[] args)
        {

            var input = Console.ReadLine().Split(' ').ToArray();

            string command = Console.ReadLine();


            while (!command.Equals("end"))
            {
                var elements = command.Split(' ').ToArray();

                if (elements[0] == "reverse")
                {
                    ReverseArray(input, elements);
                }
                else if (elements[0] == "sort")
                {
                    SortArray(input, elements);
                }
                else if (elements[0] == "rollRight")
                {
                    RollRight(input, elements);
                }
                else if (elements[0] == "rollLeft")
                {
                    RollLeft(input, elements);
                }


                command = Console.ReadLine();

            }

            Console.WriteLine("[{0}]", string.Join(", ", input).TrimEnd());
        }

        private static void RollLeft(string[] input, string[] elements)
        {

            long numOfRotations = long.Parse(elements[1]) % input.Length;
            for (int currentElement = 0; currentElement < numOfRotations; currentElement++)
            {
                var firstElement = input[0];

                Array.Copy(input, 1, input, 0, input.Length - 1);
                input[input.Length - 1] = firstElement;
            }

        }


        private static void RollRight(string[] input, string[] elements)
        {

            long numOfRotations = long.Parse(elements[1]) % input.Length;
            for (int currentElement = 0; currentElement < numOfRotations; currentElement++)
            {
                var lastElement = input[input.Length - 1];
                Array.Copy(input, 0, input, 1, input.Length - 1);
                input[0] = lastElement;
            }

        }

        private static void SortArray(string[] input, string[] elements)
        {

            int startIndex = int.Parse(elements[2]);
            int endIndex = int.Parse(elements[4]);
            if (startIndex >= input.Length || startIndex < 0 || startIndex + endIndex > input.Length||endIndex<0)
            {
                Console.WriteLine("Invalid input parameters.");
            }
            else
            {
                Array.Sort(input,startIndex, endIndex);
            }

        }

        private static void ReverseArray(string[] input, string[] elements)
        {

            int startIndex = int.Parse(elements[2]);
            int endIndex = int.Parse(elements[4]);
            if (startIndex > input.Length || startIndex < 0 || startIndex + endIndex > input.Length||endIndex<0)
            {
                Console.WriteLine("Invalid input parameters.");
            }
            else
            {
                Array.Reverse(input, startIndex, endIndex);
            }





        }
    }
}