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.

509 + 4840 + 5618 + 9163 + 802
-19914

2837 + 8737 + 9015 - 7647 - 1903 - 3427 - 2034 - 3680 - 8565
12341

281 + 7793 + 5184 - 2962 + 4511

-14245