VowelsCount

using System;
using System.Linq;

namespace VowelsCount
{
    class Program
    {
        static void Main(string[] args)
        {
            string word = Console.ReadLine();

            int vowelCount = GetVowelsCount(word);
            Console.WriteLine(vowelCount);
        }

        static int GetVowelsCount(string word)
        {
            char[] vowel = new char[] { 'a', 'e', 'i', 'o', 'u' };

            int vowelCount = 0;

            foreach (char ch in word.ToLower())
            {
                if (vowel.Contains(ch))
                {
                    vowelCount++;
                }
            }
            return vowelCount;
        }
    }
}