#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("text.in");
ofstream fout ("text.out");
string s;
int cuvinte, litere;
bool cuvant = false;

int main() {
    getline(fin, s);
    for (int i = 0; i < s.size(); ++i) {
        if ((s[i] >= 'a' && s[i] <= 'z') || (s[i] >= 'A' && s[i] <= 'Z')) {
            ++litere;
            cuvant = true;
        }
        if (cuvant == true && (s[i] < 'A' || (s[i] > 'Z' && s[i] < 'a') || s[i] > 'z' || i == s.size() - 1)) {
            cuvant = false;
            ++cuvinte;
        }
    }
    fout << litere / cuvinte;
    return 0;
}