#include <fstream>
using namespace std;
ifstream f ("text.in");
ofstream g ("text.out");
int kca, kcu; char c;

int litera()
{
    return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');
}

int main()
{
    do c = f.get(); while ( !litera() );
    while (c != -1)
    {
        while ( litera() )
        {
            kca++;
            c = f.get();
        }
        kcu++;
        while ( !litera() && c != -1) c = f.get();
    }
    g << kca / kcu;
    g.close(); return 0;
}