Stateless

using System;

namespace _06.Stateless
{
    class Stateless
    {
        static void Main()
        {
            string state = Console.ReadLine();
            string fiction = Console.ReadLine();

            while (true)
            {
                while (fiction.Length > 0)
                {
                    if (state.Length > 0)
                    {
                        state = state.Replace(fiction, "");

                        if (state.Length != 0)
                        {
                            if (state[0] == ' ' && state.Length >= 2)
                            {
                                state = state.Remove(0, 1);
                            }
                            else if (state[state.Length - 1] == ' ' && state.Length >= 1)
                            {
                                state = state.Remove(state.Length - 1, 1);
                            }
                        }
                    }

                    fiction = fiction.Remove(0, 1);

                    if (fiction.Length == 0)
                    {
                        break;
                    }
                    fiction = fiction.Remove(fiction.Length - 1, 1);

                }

                if (state.Length == 0)
                {
                    Console.WriteLine("(void)");
                }
                else
                {
                    Console.WriteLine(state);
                }

                state = Console.ReadLine();

                if (state == "collapse")
                {
                    break;
                }
                fiction = Console.ReadLine();
            }
        }
    }
}