/// Craciun Catalin
///  Text
///   www.infoarena.ro/problema/text
#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");

char t;
long lit=0; /// Numarul de litere
long cuv=0; /// Numarul de cuvinte
long rez; /// Rezultatul

void parcurgere(){
    /// Parcurg sirul de caractere
    bool ok;
    while (f.get(t)){
        ok=false;
        while ((t>='A' && t<='Z')||(t>='a' && t<='z')){
            f.get(t);
            ok=true;
            lit++;
        }
        if (ok)
            cuv++;
    }

    rez=lit/cuv;
}

int main(){

    parcurgere();
    g<<rez;
    g.close();

    return 0;
}