#include <fstream>

using namespace std;

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

char c;
bool cuv;
int nrLit, nrCuv;

int main() {
    while(fin.get(c)) {
        if(isalpha(c)) {
            nrLit++;
            cuv = true;
        } else {
            if(cuv) {
                nrCuv++;
            }
            cuv = false;
        }
    }
    fout << (nrCuv == 0 ? 0 : nrLit / nrCuv);
    return 0;
}