#include <fstream>
#include <cstring>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
char sir[1024*1024],*p, sep[]=",-!/.@#$%^&*()+= ";
int cuvinte, litere;
int main (){
    in.get(sir, 1024*1024);
    p=strtok(sir,sep);
    while(p){

        cuvinte++;
        litere=litere+strlen(p);
        p=strtok(NULL,sep);
    }
    out << litere/cuvinte;
    return 0;

}