#include <fstream>
using namespace std;

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

unsigned long long ln, nr;

int main()
{
    char c;
    bool ok = 0;
    while(f.get(c))
    {
        if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
            ok = 1;
            ++ln;
        }
        else {
            ++nr;
            ok = 0;
        }
    }
    if (nr == 0) {
        g << 0;
    }
    else {
        g << ln / nr;
    }
    return 0;
}