#include <fstream>
#include <iostream>
using namespace std;
int main ()
{
    ifstream f("text.in");
    ofstream g("text.out");
 
    char litera, semn;
    int nr_cuvinte, nr_litere;
 
    nr_cuvinte=0; nr_litere=0;
 
    while(f.get(litera))
    {
        if((litera>='A' && litera<='Z') || (litera>='a' && litera<='z'))
            nr_litere++;
        else
            if((semn>='A' && semn<='Z') || (semn>='a' && semn<='z'))
                nr_cuvinte++;
        semn=litera;
    }
 
    g<<nr_litere/nr_cuvinte;
 
    f.close();
    g.close();
 
    return 0;
}