#include<fstream>
#include<string>
using namespace std;
int main()
{
char sir[11000],*c;
int cuv=0,lit=0;
 ifstream in("text.in");
 ofstream out("text.out");
 in.get(sir,10000);
 c=strtok(sir," ,.!?");
 cuv++;
 lit+=strlen(c);
 do
 {
  c=strtok(NULL," ,.!?");
  cuv++;
  lit+=strlen(c);
 }while(c);
 int medie=lit/cuv;
 out<<medie;
 in.close();
 out.close();
 return 1;
}