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.

1649 + 4642 + 613 - 7051 - 8575
12020

9689 - 3967 - 2592 - 3020 - 6589
25857

9860 - 9240 + 659 - 3744 + 9054 + 8937 + 2507 - 329

2016