#include <fstream>
using namespace std;
int i,l,k,j,lung,t,n;
bool isLitera(char a){
    if (((a>='a') && (a<='z')) || ((a>='A') && (a<='Z'))) return true;
    return false;
}
int main()
{
    char c;
    ifstream in("text.in");
    ofstream out("text.out");
    c=in.get();
    while (!in.eof())
    {

        if (isLitera(c)) {t++; k=1;}
        else if (k) {n++; k=0;}
        c=in.get();
    }
    out << t/n;

    return 0;
}