int countLowercase(string s)
{
	int n = s.length();
	if (n == 0)
		return 0;
	else
	{
		if (s[0] >= 'a' && s[0] <= 'z')
			return 1 + countLowercase(s.substr(1,n-1));
		else
			return countLowercase(s.substr(1,n-1));
	}
}