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

using namespace std;

int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");
    int nr=0,nrcar=0,nrcuv=0;
    string s;

    while(!fin.eof())
    {
        fin>>s;
        nrcuv++;
        for(unsigned int i=0;i<s.length();i++)
            if(isalpha(s[i]))
                nrcar++;
            else if(s[i]=='-' && isalpha(s[i-1]) && isalpha(s[i+1]))
                nrcuv++;
        nr=(int)(nrcar/nrcuv);
    }
    fout<<nr;
    fin.close();
    fout.close();

    return 0;
}