#include <bits/stdc++.h>

using namespace std;
ifstream in("text.in");
ofstream out("text.out");

int main()
{
    char x;
    int nrcuv=0,nrlit=0;
    while (in)
    {
        in.get(x);
        if (isalpha(x))
            nrlit++;
        else if (x == ' ' || x == '-')
            nrcuv++;
    }
    if (nrcuv == 0)
        nrcuv = 1;
    out << nrlit/nrcuv;
}