#include <iostream>
#include <fstream>
using namespace std;

int main()
{
ifstream ti("text.in");
ofstream to("text.out");

 char txt; int litere=0,cuvinte=0,ltxt=0; //ltxt=lungime text
    while (ti.get(txt))
        {
            if(((txt>='a')&&(txt<='z'))||((txt>='A')&&(txt<='Z'))) litere++;
                else { if(litere) cuvinte++;
                        ltxt=ltxt+litere; //sau ltxt+=litere;
                        litere=0;
                     }

        }
        to<<ltxt/cuvinte;

    return 0;
}