using System;

using System.Linq;

using System.Collections.Generic;                   

public class Program

{

    public static void Main()

    {

        var names = Console.ReadLine().Split(',').ToList();

​

            while (true)

            {

                var command = Console.ReadLine();

                if (command == "Add student")

                {

                    names.Add(Console.ReadLine());

                }

                else if (command == "Add student on position")

                {

                    var newS = Console.ReadLine();

                    var pos = int.Parse(Console.ReadLine());

                    names.Insert(pos, newS);

                }

                else if (command == "Remove student on position")

                {

                    names.RemoveAt(int.Parse(Console.ReadLine()));

                }

                else if (command == "Remove last student")

                {

                    var lastname = names.Last();

                    names.Remove(lastname);

                }

                else if (command == "Remove first student")

                {

                    var firstname = names.First();

                    names.Remove(firstname);

                }

                else if (command == "END")

                {

                    break;

                }

                Console.WriteLine(String.Join(" ", names));

            }

    }

}