#include <fstream>
#include <cstring>

using namespace std;

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

char s;
int lg, nrcuv, nr, ind, i;

int main() {
    while(fin.get(s)) {
        if(('a' <= s && s <= 'z') || ('A' <= s && s <= 'Z')) nr++;
        else {
            if(ind != i) {
                nrcuv++;
            }
            ind = i + 1;
        }

        i++;
    }

    //fout << nr << " / " << nrcuv << " = ";
    fout << nr / nrcuv << '\n';

    fin.close();
    fout.close();

    return 0;
}