#include <fstream>

#include <iostream>

using namespace std;

char c;

int ltotal,nrcuv,lcuv;



ifstream fin("text.in");

ofstream fout("text.out");



int main()

{

    while(fin.get(c)){

        if((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')){

            lcuv++;

            ltotal++;

            //cout << c;

        }else{

            //cout << "\n";

            if(lcuv != 0){

                nrcuv++;

            }

            lcuv = 0;

        }

    }

    if(nrcuv == 0){

        fout << "0\n";

        return 0;

    }

    fout << ltotal/nrcuv << "\n";

    //cout << nrcuv << " : "<< ltotal << "\n";

    return 0;

}