using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        //FILA

        Queue<int> fila = new Queue<int>();

        fila.Enqueue(1);

        fila.Enqueue(2);

        fila.Enqueue(3);

        fila.Enqueue(4);

        fila.Dequeue();

        foreach (var item in fila)

        {

            Console.WriteLine(item);

        }

        //Mostra o elemento com prioridade de saída

        Console.WriteLine(fila.Peek());

}

}