#include <iostream>
#include <algorithm>
#include <fstream>
#include <vector>
#include <cstring>

using namespace std;

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

bool isLetter(char letter) {
    return ('a' <= letter && letter <= 'z') || ('A' <= letter && letter <= 'Z');
}

int main() {
    string s;
    int totalSum = 0, countWords = 0;
    while(fin >> s) {
        bool isWord = true;
        for (int i = 0; i < s.size(); ++i) {
            if (isLetter(s[i])) {
                if (isWord) {
                    ++countWords;
                    isWord = false;
                }
                ++totalSum;
            } else {
                isWord = true;
            }
        }
    }
    fout << totalSum / countWords;
    return 0;

}