Array Manipulator

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

namespace _05.Array_Manipulator
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> inputNumbers = Console.ReadLine().Split(' ').Select(int.Parse).ToList();

            string command = Console.ReadLine();

            List<int> sumNumbers = new List<int>();

            while (command != "print")
            {
                string[] inputCommands = command.Split(' ');

                if (inputCommands[0] == "add")
                {
                    int index = Int32.Parse(inputCommands[1]);
                    int element = Int32.Parse(inputCommands[2]);

                    inputNumbers.Insert(index, element);

                } else if (inputCommands[0] == "addMany")


                {
                    int index = Int32.Parse(inputCommands[1]);

                    for (int i = 2; i < inputCommands.Length; i++)
                    {
                        int element = Int32.Parse(inputCommands[i]);


                            inputNumbers.Insert(index+i-2, element);








                    }

                } else if (inputCommands[0] == "contains")
                {
                    int element = Int32.Parse(inputCommands[1]);

                    if (inputNumbers.Contains(element))
                    {
                        Console.WriteLine(inputNumbers.IndexOf(element));
                    } else
                    {
                        Console.WriteLine("-1");
                    }
                } else if (inputCommands[0] == "remove")
                {
                    int index = Int32.Parse(inputCommands[1]);

                    inputNumbers.RemoveAt(index);


                } else if (inputCommands[0] == "shift")
                {
                    int position = Int32.Parse(inputCommands[1]);


                    for (int i = 0; i < position; i++)
                    {
                        int first = inputNumbers[i];
                        inputNumbers.RemoveAt(i);
                        inputNumbers.Add(first);


                    }

                } else if(inputCommands[0]== "sumPairs")
                {
                    for (int i = 0; i < inputNumbers.Count-1; i++)
                    {
                        inputNumbers[i] = inputNumbers[i] + inputNumbers[i + 1];
                        inputNumbers.RemoveAt(i + 1);

                    }



                }

                command = Console.ReadLine();
            }


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

        }
    }
}