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:
3421 - 71 + 7643 - 8661 + 520 - 6536 + 9411

Ex Output:
1115


Ex Input:
9689 - 3967 - 2592 - 3020 - 6589

Ex Output:
25857


Ex Input:
9464 - 8791 + 8730 + 4167 + 6109 + 7659 - 3320 - 576

Ex Output:

-4514