#include <bits/stdc++.h>

using namespace std;

int main() {
    ifstream in("text.in");

    int lg_totala = 0;
    int nr_cuvinte = 0;

    bool in_cuvant = false;
    char ch;
    while ((ch = in.get()) && in) {
        if (isalpha(ch)) {
            lg_totala += 1;

            if (!in_cuvant) {
                nr_cuvinte += 1;
                in_cuvant = true;
            }
        } else {
            in_cuvant = false;
        }
    }

    ofstream out("text.out");
    if (nr_cuvinte != 0) {
        out << (lg_totala / nr_cuvinte) << endl;
    } else {
        out << 0 << endl;
    }
}