Guidance with employee shift schedule

Hello,
I attached a worksheet from February, it contains 2 sheets:

1. input
2. output


The input sheet:
- a monthly requests input sheet
* '1' - block the date
* '3' - prefer the date
* ' ' - the date is not blocked, nor preferred [I can schedule the employee on that date]

*Each employee can choose how many shifts to be scheduled [minimum '1']

* Each date requires 2 employees

*The input sheet requires some 'cleaning':
- The shifts are only on 'Sundays', 'Mondays' and 'Wednesdays'.
- It would be simpler if it would automatically remove the unnecessary days, or simply auto-create a monthly table with the 3 days only


Is it possible to create the output automatically or at least some of it?

Are there any suggestions to adjust the input sheet, to be more "automatable"?

Thank you!
Amir Zbede