#include <fstream>

using namespace std;

ifstream f("text.in");
ofstream g("text.out");

char s,ant='!';
int cuv,lg,i;

bool letter(char &x) {
    if (('a'<=x && x<='z') || ('A'<=x && x<='Z')) return true;
    return false;
}

int main() {
    while (f.get(s)) {
        if (letter(s)) lg++;
        if (letter(s) && !letter(ant)) cuv++;
        ant=s;
    }
    g << lg/cuv << '\n';
    f.close();g.close();
    return 0;
}