#include <iostream>
#include <fstream>

using namespace std;

int main() {
	ifstream fin("text.in");
	ofstream fout("text.out");
	char litera;
	unsigned int cuv, nr, total;
	cuv = 0;
	nr = 0;
	total = 0;
	while (fin.good()) {
		fin.get(litera);
		if ((litera >= 'a' && litera <= 'z') || (litera >= 'A' && litera <= 'Z')) {
			cuv++;
			total++;
		} else if (cuv > 0) {
			cuv = 0;
			nr++;
		}
	}
	fout << total / nr;
	return 0;
}