#include<fstream>
#include<cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char a,sep[]=" ?!-.,",*p;
int s=0,nr=0,nrnr=0;
int main(){
    while(f.get(a))
        if(isalpha(a))
            nr++;
        else{
            if(nr!=0){
                s=s+nr;
                nrnr++;
            }
            nr=0;
        }
    g<<s/nrnr;
    f.close();
    g.close();
    return 0;
}