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.

1137 - 2413 - 5470 - 9797 + 2566
16251

1649 + 4642 + 613 - 7051 - 8575
12020

4500 - 8163 - 6360 - 2953

21976