Cell 'Import Sheet'!X2 contains text in both uppercase, propercasing, and lowercasing....such as YES, NO, Yes, No, yes, no, Unknown

I am trying to write a formula that will convert everything to uppercase...trim to just the 1st character...then determine if Y then result is Y...if N then result is N...if anything else it is blank

here is what I wrote and I get a formula error:

=IF((PROPER(LEFT('Import Sheet'!X2,1)))="Y","Y",(PROPER(LEFT('Import Sheet'!X2,1)))="N","N","")