#include <fstream>

using namespace std;

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

string s;
int cuv,lg,i;

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

int main() {
    getline(f,s);
    for (i=0;i<s.size();i++) {
        if (letter(s[i])) {
            cuv++;
            while (letter(s[i])) {
                lg++;
                i++;
            }
            i--;
        }
    }
    g << lg/cuv << '\n';
    f.close();g.close();
    return 0;
}