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

namespace _9._Simple_Text_Editor_REAL_EXE
{
    class Program
    {
        static void Main(string[] args)
        {
            int countOfOperations = int.Parse(Console.ReadLine());
            var stack = new Stack<string>();
            StringBuilder stringBuilder = new StringBuilder();
            string finalText = string.Empty;
            for (int i = 0; i < countOfOperations; i++)
            {
                var command = Console.ReadLine();
                var commandInList = command.Split(' ', StringSplitOptions.RemoveEmptyEntries).ToArray();
                if (commandInList[0] == "1")
                {
                    stack.Push(command);
                    stringBuilder.Append(commandInList[1]);
                    finalText += stringBuilder.ToString();
                    stringBuilder = new StringBuilder();
                }

                else if (commandInList[0] == "2")
                {
                    int count = int.Parse(commandInList[1]);
                    int startIndex = (finalText.Length) - count;
                    if (startIndex >= 0)
                    {
                        string erasedText = finalText.Substring(startIndex, count);
                        finalText = finalText.Remove(startIndex, count);
                        stack.Push(erasedText);
                    }

                }

                else if (commandInList[0] == "3")
                {
                    int position = int.Parse(commandInList[1]) - 1;
                    if (position < finalText.Length && position >= 0)
                    {
                        Console.WriteLine(finalText[position]);
                    }
                }

                else if (commandInList[0] == "4")
                {
                    if (stack.Any())
                    {
                        string com = stack.Pop();
                        if (com.StartsWith('1'))
                        {
                            com = com.Remove(0, 2);
                            int index = finalText.IndexOf(com);
                            finalText = finalText.Remove(index, com.Length);
                        }

                        else
                        {
                            finalText += com;
                        }
                    }

                }
            }
        }
    }
}