Given a snowboarder’s starting stance and a rotation in degrees, determine their landing stance.
- A snowboarder’s stance is either
"Regular" or "Goofy".
- Trick rotations are multiples of 90 degrees. Positive indicates clockwise rotation, and negative indicate counter-clockwise rotation.
- The landing stance flips every 180 degrees of rotation.
For example, given "Regular" and 90, return "Regular". Given "Regular" and 180 degrees, return "Goofy".