Try

A2
Formula: copy to clipboard
=IFERROR(INDEX(Sheet1!$A$2:$A$4,SMALL(INDEX((Sheet1!B$2:B$4<>"x")*10^10+ROW(Sheet1!$B$2:$B$4)-ROW(Sheet1!$B$2)+1,),ROWS(A$1:A1))),"")


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