Simple Text Editor

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

namespace _10.SimpleTextEditor
{
    public class SimpleTextEditor
    {
        public static void Main()
        {
            int n = int.Parse(Console.ReadLine());

            string text = "";

            var stack = new Stack<string>();

            for (int i = 0; i < n; i++)
            {
                string[] commandArgs = Console.ReadLine().Split();

                if (commandArgs[0] == "1")
                {
                    text = commandArgs[1];
                    stack.Push(text);
                }

                else if (commandArgs[0] == "2")
                {
                    int eraseNum = int.Parse(commandArgs[1]);

                    if (text.Length == eraseNum)
                    {
                        text = "";
                    }

                    else
                    {
                        text = text.Take(text.Length - eraseNum).ToString();
                    }

                    stack.Push(text);
                }

                else if (commandArgs[0] == "3")
                {
                    int index = int.Parse(commandArgs[1]);
                    Console.WriteLine(text[index - 1]);
                }
                else
                {
                    stack.Pop();
                    text = stack.Peek();
                }

            }

        }
    }
}