#include <fstream>
using namespace std;
ifstream in ("text.in");
ofstream out ("text.out");
int main()
{
    char c,ant;
    int nrlit=0,nrcuv=0;
    in.get(c);
    ant=c;
    while (c!=EOF && c!='\n')
    {
        in.get(c);
        if ((int(c)<=90 && int(c)>=65) || (int(c)>=97 &&int(c)<=122))
            nrlit++;
        else if (int(c)<=64 || (int(c)>=91 && int(c)<=96) || int(c)>=128)
        {
            if ((int(ant)<=90 && int(ant)>=65) || (int(ant)>=97 &&int(ant)<=122))
                nrcuv++;
        }
        ant=c;
    }
    out<<nrlit/nrcuv;
    return 0;
}