using System;
using System.Collections.Generic;
public class Program
{
public static void Main()
Queue<string> Cola = new Queue<string>();
Cola.Enqueue ("Primero");
Cola.Enqueue ("Segundo");
Cola.Enqueue ("Tercero");
Cola.Enqueue ("Cuarto");
while (Cola.Count>=1)
Console.WriteLine(Cola.Dequeue());
}