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

    int litere = 0 , cuvinte = 0 ,aux = 0;
    char s;
    ifstream in("text.in");
    ofstream out("text.out");
    while(in.get(s))
    {
        if(isalpha(s)) litere++;
            else
            {
                if (litere != 0) {cuvinte++;aux+=litere;litere=0;}
            }
    }
    out<<aux/cuvinte;
    out.close();
    in.close();
    return 0;
}