#include <fstream>
std::ifstream fin("text.in");
std::ofstream fout("text.out");

int main()
{
    char C;
    int NrLitere=0;
    int NrCuvinte = 0;
    while ((C=fin.get())&&C!=EOF)
    {
        if ((C<='z'&&C>='a')||(C<='Z'&&C>='A'))
        {
            NrLitere++;
        }
        if (C==' ')
        {
            NrCuvinte++;
        }
    }
    if (C!=' ') NrCuvinte++;
    fout << NrLitere/NrCuvinte;
}