#include <fstream>

using namespace std;

char ch;

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

int nrcuv, nrlung;

int main()
{
    while (f.get(ch))
    {
        if ( (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z'))
        {
            nrcuv ++;
            nrlung ++;
            f.get(ch);
            while ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z'))
            {
                nrlung ++;
                f.get(ch);
            }
        }
    }

    g << nrlung / nrcuv << '\n';
    return 0;
}