|Try these two formula:|
If it is in Column A, but not column B : =IF(ISERROR(MATCH(A1,$B$1:$B$32,0)),A1,"")
If it is in Column B, but not column A : =IF(ISERROR(MATCH(B1,$A$1:$A$32,0)),B1,"")
This is for the first 32 rows, modify to suit your needs.
See how that works for you.