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.

Ex Input:
3997 - 5279 - 8866 - 8214 - 3538 + 6690 - 4565 + 30

Ex Output:
27739


Ex Input:
4148 + 9216 - 5756 - 5558 + 2801 - 7501 + 1939 + 3102 + 6894

Ex Output:
-989


Ex Input:
1709 - 2270 - 1077 - 9681

Ex Output:

14737