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

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

    std::string cuv;
    int s=0, v=0;
    while (f>>cuv)
    {
        v++;
        for (size_t i=0; i<cuv.size(); i++)
        {
            if ((('a' <= cuv.at(i)) && (cuv.at(i) <= 'z')) || (('A' <= cuv.at(i)) && (cuv.at(i) <= 'Z')))
            {
                s++;
            }
            else if (cuv.size()<i+1)
            {
                if (cuv.at(i+1)>=65||cuv.at(i+1)<=122)
                {
                    i++;
                    s++;
                    v++;
                }
            }
        }
    }

    g << int(s/v);
}