using System;

using System.Collections;

public class Program

{

    public static Queue myQ = new Queue();

    public static void Main()

    {

        Console.WriteLine("Menu: Add(1), Remove(2), Display(3), Clear(4), Quit(5)"); int menu = Convert.ToInt32(Console.ReadLine());

        if(menu == 1){Add();}

        else if(menu == 2){Remove();}

        else if(menu == 3){Display();}

        else if(menu == 4){Clear();}

        else if(menu == 5){Quit();}

        else{Console.WriteLine("Invalid Input");}

    }

    static void Add()

    {

        Console.WriteLine("Enter the value to be added: "); myQ.Enqueue(Console.ReadLine());

        Main();

    }

    static void Remove()

    {

        if(myQ.Count != 0)

        {

        Console.WriteLine("{0} has been removed",myQ.Dequeue());

        }

        else{Console.WriteLine("There are no value in the queue");}

        Main();

    }

    static void Display()

    {

        if(myQ.Count != 0)

        {

            foreach(string i in myQ)

            {

                Console.WriteLine(i);       

            }

        }

        else{Console.WriteLine("There are no value in the queue");}

        Main();

    }

    static void Clear()

    {

        myQ.Clear();

        Main();

    }

    static void Quit(){}

}