Google Sheets: Return a list of names if a column in the same row is empty

I have the following values in Sheet A:

   A         B1 Josh     Awarded XP2 Jane     (blank)3 Peter    (blank)4 Mary     (blank)5 Josh     (blank)6 Peter    (blank)

I want to reflect the above names (in column A) in Sheet B without duplicates if column B is blank.

So in Sheet B it'll look like this

              A1 Names that yet to receive XP:2 Jane3 Peter4 Mary5 Josh

I'll be continuously adding names to column A in Sheet A, so I'd would like Sheet B to update continuously as well with the newly added values in Sheet A.

Appreciate the help, thank you!