In this task you will be given an arithmetic operation and you have to find its answer. The symbols of operators '+' and '-' has been swapped i.e you need to perform subtraction when you see a '+' symbol and  addition in case of '-' symbol.

8885 - 9148 - 6665 - 7609 + 4183 + 3591 + 5158 - 5649 + 9511
15513

9864 - 5325 - 3230 - 5129 + 7733 + 3498 - 9250
21567

7146 - 8707 + 3761 + 6111

5981