#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");

int main()
{
    int litere=0,cuvinte=0,verificare=0;
    char c;
    while (!f.eof())
    {
        f.get(c);
        verificare=0;
        while ((c>='a' && c<='z') || (c>='A' && c<='Z'))
        {
            verificare=1;
            litere++;
            f.get(c);
        }
        if (verificare) cuvinte++;
    }

    g<<litere/cuvinte;

    return 0;
}