#include <fstream>
using namespace std;
int nrCaract, nrCuv;
bool cuvBun;
char caracter;
ifstream fin ("text.in");
ofstream fout ("text.out");
int main()
{
    while( !fin.eof() )
    {
        fin.get(caracter);
        if( ( (caracter >= 'A') && (caracter <= 'Z') ) || ( (caracter >= 'a') && (caracter <= 'z') ) )
        {
            nrCaract++;
            cuvBun = true;
        }
        else
        {
            if( cuvBun )
            {
                nrCuv++;
                cuvBun = false;
            }
        }
    }
    fout << nrCaract/nrCuv;
    return 0;
}