using System;

​

public class Program

{

    public static void Main()

    {

        int vowel = 0;

        int cons = 0;

        string[] arr = new string[]{"test"};

        foreach (var s in arr) // s is a string

        {

            for (int i = 0; i < s.Length; i++)

            {

                if (s[i] == 'a' || s[i] == 'e' || s[i] == 'i' || s[i] == 'o' || s[i] == 'u')

                {

                    vowel++;

                }

                else

                    cons++;

            }

        }

​

        Console.WriteLine(vowel);

    }

}