FYI I wouldn't use the term Long Sell with UA. Long Sell in the SHARES world is selling a segment without looking at availability.
So instead of:
A LAXMUC-LH
N1Y1
It's:
0LH453Y19JUNLAXMUCHK1*LH
First thing I thought you were talking about was the long sell command above. I've never heard the term used otherwise.