02. Vowels Count

using System;

namespace _02._Vowels_Count
{
    class Program
    {
        static void Main(string[] args)
        {
            string singalString = Console.ReadLine().ToLower();

            double vowels = FinedVowels(singalString.Length, singalString);

            Console.WriteLine(vowels);
        }

        static double FinedVowels(double singalStringLength, string singalString)
        {
            double vowels = 0;
            for (int i=0; i< singalStringLength; i++)
            {
                char symbol = singalString[i];

                if(symbol=='a' || symbol == 'e' || symbol == 'u' ||
                    symbol == 'o' || symbol == 'i')
                {
                    vowels++;
                }
            }
            return vowels;
        }
    }
}