#include <iostream>

using namespace std;
int main()
{
    string s;

    while ( !fin.eof() )
    {
        if ( fin.peek() == ' ' )
        {
            "                 fin.get();
            s += ' ';
        }
            else
        {
            fin >> ch;
            s += ch;
        }
        }
            for ( i = 0; i < s.size(); ++i )
        {
            if ( isalpha( s[i] ) || s[i] == ' ' || s[i] == '-' ) rez += s[i];
        }
            istringstream st;
            st.str( prov );
            string ss;
            while ( st >> ss )
        {
            sol.push_back( ss );
        }
            for ( j = 0 ;j < sol.size(); ++j )
        {
            lungime += sol[j].size();//fout << sol[j] << " ";
            nrc++;
        }
            ok = (int)(lungime/nrc);
            fout << ok << "\n";

            return 0;
        }