std::set<int> countClasses(std::istream& inputFile)
{
    std::string line;
    std::set <int> passengerClasses;
    while (!inputFile.eof() && inputFile.good ())
    {
        std::getline (inputFile, line);
        std::stringstream ss(line);
        std::string token;
        int cls;

        int iToken = 0;
        while (!ss.eof() && ss.good())
        {
            std::getline(ss, token,',');
            std::stringstream b;
            b << token;
            b >> cls;
            if (iToken == 2)
                passengerClasses.insert(cls);

            ++iToken;
        }
    }

    return passengerClasses;
}


void reverseVector(VecNames& vectorToPrint)
{
    for (int i = int(vectorToPrint.size()) - 1; i > 0; --i)
        std::cout << vectorToPrint[i] << "\n";
}