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.

8602 - 1293 - 8063 - 4529 + 453 - 6407
28441

6562 - 9064 - 1127 + 8483 + 5128 + 3972 - 4330 + 908 - 7990
10582

6454 - 3620 + 8521 - 5169 - 4168 + 7887

3003