#include<fstream>
using namespace std;
int main()
{

    int litere = 0 , cuvinte = 0 , itr = 0;
    char s,pred ='@';
    ifstream in("text.in");
    ofstream out("text.out");
    while(in.get(s))
    {
        if (itr == 0 )
        {
            if ((s>='a' && s<='z') || (s>='A' && s<= 'Z')) {cuvinte++;litere++;continue;}
        }
        if ((s>='a' && s<='z') || (s>='A' && s<='Z')) litere++;
        if (((s>='a' && s<='z') || (s>='A' && s<='Z')) && (!isalpha(pred)&& itr != 0))
        {
            cuvinte++;
        }
        pred = s;
        itr++;
    }
    out<<litere/cuvinte;
    out.close();
    in.close();
    return 0;
}