A certain team has six members: secretary Zhang, director Wang, engineer Li, engineer Yang, Zhao member, Marco member  Now because of the working relationship, some members must be adjusted
It is known that: (1) only retain director Wang and engineer Li, engineer Yang, can keep secretary Zhang; (2) if we don't adjust engineer Li, we can't keep the staff member Zhao; (3) if we adjust Zhao, we must adjust Ma; (4) secretary Zhang is the core of the team and can not be adjusted
Retain Zhao staff and adjust Yang engineer.