#include <fstream>
#include <string.h>

using namespace std;
const int INT=1024;

ifstream in("text.in");
ofstream out("text.out");

int main(){
char s[INT],*p;
int caractere=0;
int cuvinte=0;
in.get(s,INT);
p=strtok(s,"-,.!? ");
while(p!=NULL){
    cuvinte++;
    caractere+=strlen(p);
    p=strtok(NULL,"-,.!? ");
    }
out<<caractere/cuvinte;
return 0;
}