#include<fstream>
#include<string>
using namespace std;
int main()
{
 char sir[50], *c;
 int cuv=0,lit=0;
 ifstream in("text.in");
 ofstream out("text.out");
 in.getline(sir,100);
 c=strtok(sir," ,.-!?");
 lit+=strlen(c);
 cuv++;
 do{
 c=strtok(NULL," ,.-!?");
 lit+=strlen(c);
 cuv++;
 }while(c);
 int med=lit/cuv;
 out<<med;
 in.close();
 out.close();
 return 0;
}