import java.util.ArrayDeque;
import java.util.Scanner;

public class SaQSimpleTextEditor {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int operationNum = Integer.parseInt(scanner.nextLine());
        ArrayDeque<String> stack = new ArrayDeque<>();

        //String[] task = scanner.nextLine().split("\\s+");

        for (int i = 0; i < operationNum; i++) {
            String[] task = scanner.nextLine().split("\\s+");
            String toDo = task[0];
            if(toDo.equals("1")) {
                String toAppend = task[1];
                if (stack.size()==0) {
                    stack.push(toAppend);
                } else {
                    toAppend = stack.peek()+toAppend;
                    stack.push(toAppend);
                }
            } else if(toDo.equals("2")){
                int toDell = Integer.parseInt(task[1]);
                int toUse = stack.peek().length()-toDell;
                String newStringToPush = "";
                String lastWorkString = stack.peek();
                for (int j = 0; j < toUse; j++) {
                    newStringToPush = newStringToPush + lastWorkString.charAt(j);
                }
                stack.push(newStringToPush);


            }else if (toDo.equals("3")) {
                int charNumToPrint = Integer.parseInt(task[1])-1;
                String workWord = stack.peek();
                System.out.println(workWord.charAt(charNumToPrint));

            }else if (toDo.equals("4")) {
                stack.pop();
            }

            //task = scanner.nextLine().split("\\s+");
        }
    }
}