#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int l, c, t, m;
char s;
int main(){
    while(f.get(s))
    {
        if( ('a'<=s && s<='z') || ('A'<=s && s<='Z') )
            l++;
        else
        {
            if(l)
                c++;
            t=t+l;
            l=0;
        }
    }
    m=t/c;
    g<<m;
    f.close();
    g.close();
    return 0;
}