#include <fstream>
#include <cstring>

using namespace std;

int main()
{
    ifstream in("text.in");
    ofstream out("text.out");
    bool in_cuvant = false;
    char c;
    int sum = 0;
    int nr_cuv = 0;

    while (in >> noskipws >> c)
    {
        if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
        {
            sum++;

            if (!in_cuvant)
            {
                in_cuvant = true;
                nr_cuv++;
            }
        }
        else
        {
            in_cuvant = false;
        }
    }

    out << sum / nr_cuv;

    return 0;
}