#include <fstream>
#include <cstring>
using namespace std;

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

int nrcuv;
int nrl;
char l;

int main()
{
    while ( is.get(l) )
    {
        if ( (l >= 'A' && l <= 'Z') || ( l >= 'a' && l <= 'z') )
            ++nrl;
        while ( is.get(l) && (l >= 'A' && l <= 'Z') || ( l >= 'a' && l <= 'z') && l != '\0' )
            ++nrl;
        ++nrcuv;
    }

    os << nrl / nrcuv;

    is.close();
    os.close();
    return 0;
}