how to choose one of two objects in int main if they both show up in the screen?

So I'm almost finish with my college project but they want me to ask the user which car he wants and with that data i have to create the object using the parameters that i previously asked. But if the user wants the "Audi A7" or the "BMW X6" i need to create an object using the set methods. The problem is that both of the objects show in screen. PD: Sorry for my bad english.

int main() {

    string extras, marca;

    cout<<endl<<" Por favor eliga uno de los siguientes vehiculos:"
    <<endl<<endl;
    cout<<" 1) Audi A7"<<endl;
    cout<<" 2) Alfa Romero Guilietta"<<endl;
    cout<<" 3) Mitsubishi Montero Wagon"<<endl;
    cout<<" 4) BMW X6 "<<endl;
    cout<<" 5) Mercedes Benz Clase GLS"<<endl;
    cout<<" 6) Volvo XC90"<<endl;
    cout<<"___________________________________________________"<<endl<<endl;
    cout<<" Escriba el nombre del vehiculo deseado: "; getline(cin,marca); cout<<endl;
    cout<<" Le gustaria agregarle los extras? "<<endl<<endl; cout<<" "; cin>>extras;
    cout<<"___________________________________________________";

    //Constructor con parametros

    Vehiculo Auto1 (extras,marca);

    cout<<endl<<Auto1.toString()<<endl;
    locale comma_locale(std::locale(), new punto());
    cout.imbue(comma_locale);
    cout<<setprecision(3)<<fixed<< " El precio final es: "<<Auto1.Decision()<<" CRC"<<endl;
    cout<<"___________________________________________________";

    //Constructor Sin Parametros

    Vehiculo Auto2;

    Auto2.setMarca(marca);
    Auto2.setExtras(extras);
    cout<<endl<<Auto2.toString()<<endl;
    cout.imbue(comma_locale);
    cout<<setprecision(3)<<fixed<< " El precio final es: "<<Auto2.Decision()<<" CRC"<<endl;
    cout<<"___________________________________________________";

    return 0;
}