For the first test case in the heavy option, the input should be: 
INPUT: room 3, apartment  2
and
INPUT: room 2, apartment 1 (not 2)

BOTH OPTIONS:
For task 8, the number of late payments can either include only the late payments in the given month or all the late payments until the given month.
In the first case, the number of late payments in December will be 2 (for North East) and 0 (for South West). If you choose to include all the late payments, the values will be the same as in the project description 3 (for North East) and 1 (for South West).