#include<fstream>
using namespace std;
int numar, cuvinte;

ifstream in ("text.in");
ofstream out ("text.out");
char c;
int main(){

    while(in.get(c)) {

        if(isalpha(c)) {

            cuvinte++;
            while (isalpha(c)) {

                numar++;
                in.get(c);
            }
        }
    }
    out << numar / cuvinte   << '\n';

    in.close();
    out.close();
    return 0;

}