#include"fstream.h"
#include"string.h"
int main()
{char sir[50], *c;
int cuv=0,lit=0;
 ifstream in("text.in");
 ofstream out("text.out");
 in>>sir;
 c=strtok(sir," ,.;:-!?0123456789");
 lit+=strlen(c);
 cuv++;
 do{
 c=strtok(NULL," ,.;:-!?0123456789");
 lit+=strlen(c);
 cuv++;
 }while(c!=NULL);
 int med=lit/cuv;
 out<<med;
 in.close();
 out.close();
 return 0;
}