using System;

using System.Linq;

public class Program

{

static Func<string,int> test = (a) => (from a,"aeiou" select 1).Sum(); 

public static void Main(string[] args)

{

Console.WriteLine(test("abcdefghijklmnopqrstuvwxyz")==5);

Console.WriteLine(test("ABCDEFGHIJKLMNOPQRSTUVWXYZ")==5);

Console.WriteLine(test("aaa")==3);

Console.WriteLine(test("")==0);

}

}

​