SimpleTextEditor - Reafctoring

using System;
using System.Collections.Generic;

namespace SimpleTextEditor
{
    class TextEditor
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());
            var text = "";
            var stack = new Stack<string>();

            for (int i = 0; i < n; i++)
            {
                var parts = Console.ReadLine().Split(new char[] {' '}, StringSplitOptions.RemoveEmptyEntries);
                var command = int.Parse(parts[0]);

                switch (command)
                {
                    case 1:
                        text +=(parts[1]);
                        stack.Push(text.ToString());
                        break;
                    case 2:
                        var index = int.Parse(parts[1]);
                        text = text.Remove(text.Length - index, index);
                        stack.Push(text.ToString());
                        break;
                    case 3:
                        var charIndex = int.Parse(parts[1]) - 1;
                        Console.WriteLine(text[charIndex]);
                        break;
                    case 4:
                        if (stack.Count>1)
                        {
                            stack.Pop();
                            text = "";
                            text = (stack.Peek());
                        }
                        else if (stack.Count==1)
                        {
                            stack.Pop();
                            text = "";
                        }
                        break;

                }
            }
        }
    }
}