int countChar(const std::string &s) {

	struct ischar {
		ischar() {};
		ischar(unsigned char x) : x(x) {}
		bool operator()(unsigned char y) const {
			if (std::isalpha(y))
				return true;
			else
				return false;
		}

	private:
		unsigned char x;
	};

	ischar kat;

	return count_if(s.begin(), s.end(), kat);
}