#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream f ("text.in");
    ofstream g ("text.out");
    char caracter;
    int contorCuv, lung, lungSir;
    lung = 0;
    contorCuv = 0;
    lungSir = 0;
    while (!f.eof())
    {
        f.get(caracter);
        if (isalpha(caracter) && caracter != ' ')
            lung++;
        else
        {
            if (lung)
            {
                lungSir += lung;
                contorCuv++;
                lung = 0;
            }
        }
    }
    g << lungSir / contorCuv;
    f.close();
    g.close();
    return 0;
}