using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        Queue<string> planets = new Queue<string>();

        // Add items for testing

        planets.Enqueue("Mercury");

        planets.Enqueue("Venus");

        planets.Enqueue("Earth");

​

        // Peek() to return single item from the top without removing it from the collection

        Console.WriteLine(planets.Peek());

    }

}