How do I enter 1099-S?

I received a 1099-S from my Mother’s Trust as a result of her home selling.  I also received a K-1 do to loses regarding the property.  I am one of 4 beneficiaries.  I entered the K-1 information but am unable to find where I must enter the info from my 1099-S.  The accountant that did my mother’s probate trust taxes stated the benficiaries should not have to pay any monies on taxes.  The basis of the home when she died and the amount the home sold for are the same.  There have been improvements to her home since she died and closing costs were paid.  So where do I enter the 1099-S information?  Thank you for your time.