package com.company;

import java.util.Arrays;
import java.util.Scanner;

public class Numbers {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String[] command = scanner.nextLine().trim().split(" ");
        String num = new String();
        String keeper = new String();
        while(true)
        {

if (command[0].contains("end"))
{

    break;
}
            if (command[0].contains("set"))
            {
                num = command[1];
            }
            else if (command[0].contains("front-add"))
            {

              num = command[1]+num;
            }
            else if (command[0].contains("front-remove"))
            {
             num = num.substring(1);
            }
            else if(command[0].contains("back-add"))
            {

             num = num + command[1];
            }
            else if(command[0].contains("back-remove"))
            {
                num = num.replace(num.substring(num.length()-1), "");

            }
            else if (command[0].contains("reverse"))
            {
                keeper = num;
                num = new String();
                for(int i=keeper.length()-1; i>=0; i--) {
                    num = num + keeper.charAt(i);
                }



            }
            else if (command[0].contains("print"))
            {
                System.out.println(num);
            }
            command = scanner.nextLine().trim().split(" ");

        }



    }


}