#include <fstream>
#include <string>

inline bool isAlpha(char c)
{
    return ('a'<=c&&c<='z') ||('A'<=c&&c<='Z');
}
int main()
{
    std::ifstream in("text.in");
    std::ofstream out("text.out");
    char c;
    long n_alphas = 0, n_words = 0, ctr=0;
    bool prev_alpha = false;
    while(in.get(c)) {
        ++ctr;
        if(isAlpha(c)) {
            if(!prev_alpha) {
                ++n_words;
            }
            prev_alpha = true;
            ++n_alphas;
        }
        else {
            prev_alpha = false;
        }
    }
    out<<n_alphas/n_words<<'\n';
    return 0;
}