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:
9808 + 7071 + 9458 - 8326 - 6406 - 6771 - 1321 + 4712

Ex Output:
11391


Ex Input:
9491 + 8647 - 4571 + 8815 - 4816 - 8552 + 1794

Ex Output:
8174


Ex Input:
640 - 2534 + 8069 - 6819 + 317 - 9009 + 7022 + 7116

Ex Output:

-3522