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

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

int main ()
{
    long long l_tot = 0, nr_cuv = 0;
    bool cuvant = false;
    char c;
    while (f.get(c))
    {
        if ((c>='a' && c<='z')||(c>='A' && c<='Z'))
        {
            l_tot++;
            cuvant = true;
        }

        else
        {
            if (cuvant)
                nr_cuv++;
            cuvant = false;
        }
    }
         if (cuvant)
                nr_cuv++;

    g<<l_tot/nr_cuv;
}