Count U slots

Dear Experts, 

                    I have a case like below:-

So, there's a Worksheet "Calc" below where we have Slots from 0~19 two times from Col (C~V) and (X~AQ);

In ,Sheet2 we have the Logic on how to count the U slots:-

1D --> 1 symbol DL
2DD --> 2 symbols DL
2DU/2UD --> 1 symbol for UL, 1 symbol for DL
1U --> 1 symbol UL
2UU --> 2 symbols UL
1S (for split) --> Half symbol for UL, Half symbol for DL

Can you please provide a formula for Column AS and AT to count the U slots, using above Logic,

Attached is the Worksheet.