#include <fstream>

using namespace std;

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

int main() {
    unsigned int wordCounter = 0, letterCounter = 0;
    bool state;
    char c;

    while (fin.get(c)) {
        if (isalpha(c)) {
            letterCounter++;
            state = false;
        }

        else {
            if (!state)
                wordCounter++;
            state = true;
        }
    }

    fout << letterCounter / wordCounter;
}