using System;

using System.Linq;

​

public class Program

{

    static readonly string[] Fruits = new[]

    {

        "Acai",

        "Apple",

        "Apricots",

        "Banana",

        "Blackberry",

        "",

        "Blueberry",

        "Cherries",

        "Coconut",

        "Cranberry ",

        "Cucumber",

        "Currents",

        "Dates",

        "Durian",

        "Fig",

        "Goji berries",

        "Gooseberry",

        "Grapefruit",

        "Grapes",

        "Jackfruit",

        "Kiwi",

        "Kumquat",

        "Lemon",

        "Lime",

        "Lucuma",

        " Lychee",

        "Mango",

        "Mangosteen",

        "Melon",

        "",

        "Mulberry",

        "Nectarine",

        "Orange",

        "Papaya",

        "Passion Fruit",

        "Peach",

        "Pear",

        "Pineapple ",

        "Plum",

        "Pomegranate",

        "Pomelo",

        "Prickly Pear",

        "Prunes",

        "Raspberries",

        "Strawberries",

        "Tangerine",

        "Watermelon"

    };

​

    static void Main()

    {

        // Do your work here...

        var result = from s in Fruits

                              orderby s.Length descending

                              where s.Trim().Contains(" ") == false || s.Contains("") == false

                              select s.Trim().ToLower();

​

        Console.WriteLine("Answer: {0}", String.Join(", ", result));

    }

}

​