#include <iostream>
#include <chrono>
#include <fstream>
#include <string>

#define DEBUG 0

std::ifstream cin("../text.in");
std::ofstream cout("../text.out");

bool is_letter(char t) {
    return (t >= 'a' && t <= 'z') || (t >= 'A' && t <= 'Z');
}


void solve() {

    std::string input_string;
    std::getline(cin, input_string);

    int words = 0;
    int letters = 0;

    bool new_word = true;
    for (auto t: input_string) {
        int letter_count = is_letter(t);
        letters += letter_count;

        if (!letter_count) { // daca nu e litera
            new_word = true; // ne pregatim sa incepem cuvant nou
        } else if (new_word) { // data e cuvant nou
            ++words; // crestem cuvintele
            new_word = false; // si tinem minte
        }
    }
    if (DEBUG) {
        cout << letters << " " << words << " ";
    }
    cout << letters / words;
}


int main() {
    auto start = std::chrono::high_resolution_clock::now();

    solve();

    auto stop = std::chrono::high_resolution_clock::now();
    auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(stop - start);
    std::cout << std::endl << "[time]:" << duration.count() << std::endl;
    return 0;
}