#include <fstream>

using namespace std;

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

char v[100000];
int nrcuv, l;

int main()
{
    f.getline(v, 100000);
    for (int i = 1; i <= 99999; i++)
    {
        if ((v[i] >= 97 && v[i] <= 122) || (v[i] >= 65 && v[i] <= 90))
        {
            if (v[i - 1] == ' ' || v[i - 1] == '-')
                nrcuv++;
            l++;
        }
    }
    g << l / nrcuv;
}