using System;

public class Program

{

    public static void Main()

    {

    //  Console.WriteLine(CountSmall('HeLlO'));

    }

    public static int CountSmall(string str)

    {

        return CountSmall(str, 0);

    }

    public static int CountSmall(string str, int i)

    {

        if (i >= str.Length) return 0;

        if (str[i] >= 'a' && str[i] <= 'z')

            return 1 + CountSmall(str, i + 1);

        else

            return CountSmall(str, i + 1);

    }

}