#include<string.h>
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
    int i,k,nr=0,cuv=0;
    char s[10000],*p;
    fstream f("text.in",ios::in);
    fstream g("text.out",ios::out);
    f.getline(s,10000);
    strcat(s," ");
    p=strtok(s," ,;!?=");
    //cout<<p;
    while(p)
    {
        if(*p!='-'){
        k=strlen(p);
        i=0;
        while(i<k){
            if(*(p+i)!='-')
                nr++;
            else
                cuv++;
            i++;
        }
        cuv++;}
        p=strtok(NULL," ,;!?=");
    }
    g<<nr/cuv;
    f.close();
    g.close();
}