IF Statement - Accounting for blanks

Hopefully a simple question:

If the values in these columns have the same values, output a "Y", else a "N".
=IF(BV2=BW2,"Y","N")

If either Column BV or BW have a blank value, output a '-1'.

How do I modify the above formula to accomplish this?

Thank you!

Hi,

Modify the formula as following:

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