#include<fstream>

using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");

int main() {

	int cuv = false;

	char c;
	int cuvinte = 0, total = 0;
	while (fin.get(c)) {


		if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
			cuv = true,total++;
		else {
			if (cuv == true) {
				cuvinte++;
				cuv = false;
			}
		}
	}

	fout << total/cuvinte;


	fin.close();
	fout.close();
	return 0;
}