Walter, a single taxpayer, purchased a limited partnership interest in a tax shelter in 1993. He also acquired a rental house in 2019, which he actively manages. During 2019, Walter's share of the partnership's losses was $20,500, and his rental house generated $42,500 in losses. Walter's modified adjusted gross income before passive losses is $139,500.

If an amount is zero, enter "0".

a. Calculate the amount of Walter's allowable loss for rental house activities for 2019. $

b. Calculate the amount of Walter's allowable loss for the partnership activities for 2019. $

c. What may be done with the unused losses, if anything?