#include <iostream>
#include <fstream>
#include <string>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
    string s;
    int cuv=0,sum=0;
    while(f>>s)
    {
        if(s.find("-")!=std::string::npos||s.find("'")!=std::string::npos||s.find(",")!=std::string::npos){cuv++;}

        cuv++;
        sum+=s.length();
    }
    g<<sum/cuv;
    return 0;
}