class Message {
private:
    string s;
    int order;
public: 
    Message(const string& text, int Order) {
        s = text;
        order = Order;
    }
    const string& get_text() {
        return s;
    }
    bool operator < (const Message& second) {
        return order < second.order;
    }
};

class MessageFactory {
public:
    static int counter;
    MessageFactory() {}
    Message create_message(const string& text) {
        Message temp(text, counter);
        counter++;
        return temp;
    }
};

int MessageFactory::counter = 1;