#include <fstream>

using namespace std;

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

char c;
int nrlit, nrcuv, rez;

int main()
{
    while (f>>noskipws>>c)
        if ((c>='a' && c<='z') || (c>='A' && c<='Z'))
        {
            nrcuv++;
            nrlit++;
            while ((c>='a' && c<='z') || (c>='A' && c<='Z'))
            {
                f>>noskipws>>c;
                nrlit++;
            }
            nrlit--;
        }

    rez=nrlit/nrcuv;
    g<<rez;

    return 0;
}