How do i change the currentCamera Rotation by pressing W,A,S,D?

Hi, Im making a simple security camera. You should control the camera by pressing W,A,S,D. I have following:

1. Script, that changes the camera type, position and subject to the part i need it to be

2. i got while loops for everey key, that is hold down (only for W,A,S,D)

pls someody help me with this