increment row number using variable

Can any please.......ASAP..
increment row number using variable
If the data is available in the rst, the result should add to the existing data and increase rows by pasting the result


Code works :
sheet lst values (column A) mapped with sheet checks value (column I) - IF MATCHED, range should be copied from A:O and the result should pasted in rst sheet name (as same copied without any changes).

If data available : find the last row and add to the existing data.

Below code working fine : up to pastespecial....

my request : increment row number using variable
If the data is available in the rst, the result should add to the existing data and increase rows by pasting the result

Sub test3()
    Dim x As Integer, y
      Dim s As Integer, j
        x = Sheets("lst").Range("a" & Rows.Count).End(xlUp).Row
        s = Sheets("checks").Range("I" & Rows.Count).End(xlUp).Row
        a = 1
            For y = 1 To x
              For j = 1 To s
                If Sheets("lst").Cells(y, 1) = Sheets("checks").Cells(j, 9) Then
                a = a + 1
                    Sheets("checks").Range("A" & j & ":O" & j).Copy
                    Sheets("rst").Range("A1").PasteSpecial
                End If
              Next j
            Next y
End Sub

test workbook attached. Please find the attachment.

Thanks in advance...