#include <fstream>
using namespace std;

int nr_cuv, nr_litere;

void read() {
	char ch;
	ifstream f("text.in");
	while (f.get(ch)) 
		if (isalpha(ch)) {
			nr_cuv++;
			nr_litere++;
			while (isalpha(f.peek())) {
				f.get(ch);
				nr_litere++;
			}
		}
}

void output() {
	ofstream g("text.out");
	g << nr_litere / nr_cuv;
	g.close();
}

int main() {
	read();
	output();
	return 0;
}