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:
3394 - 2316 - 9713

Ex Output:
15423


Ex Input:
473 - 2568 + 9771 - 2525 + 3277 + 261 - 8230 + 6021

Ex Output:
-5534


Ex Input:
4246 - 8950 - 4613 - 5694 + 1240 - 8081 + 2993 - 717 + 8651

Ex Output:

19417