#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main ()
{
    ifstream fin ("text.in");
    ofstream fout ("text.out");
    string str;
    int nrca=0,nrcu=0;
    while (!fin.eof()){
    fin>>str;
    //cout<<"str:"<<str<<"\n";
        int n=str.length();

    char c;

    //cout<< " n="<<n<<"\n";
    for (int i=0;i<n;++i)
    {
        c=str[i];
        if ((65 <= c && 90>=c) || (97 <= c && 122>=c))
        {
            nrca++;
            //cout<<"nrca: "<<nrca<<"\n";
        }
        if (c=='-' && i!=0)
        {
            nrcu++;
        }
    }
    if (str[0]!='-')
    {
    nrcu++;
    }
    //cout<<"nrcu: "<<nrcu<<"\n"<<"\n";
    }

    nrca/=nrcu;
    fout<<nrca;
}