#include <cstring>
#include <fstream>

using namespace std;

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

int main()
{
    long long nrcuv=0,nrlit=0;
    char x,aux;
    while (in)
    {
        in.get(x);
        if (isalpha(x))
            nrlit++;
        else if (!isalpha(x) && isalpha(aux))
            nrcuv++;
        aux = x;
    }
    if (!nrcuv && !nrlit)
        out << 0;
    else
        out << nrlit/nrcuv;
}