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:
6789 - 6255 + 3477 - 8628 + 3410 + 5875 + 7308 + 2357

Ex Output:
-755


Ex Input:
1573 + 2934 + 9701

Ex Output:
-11062


Ex Input:
1620 - 2936 + 8275 + 1659 - 5719 + 5448 - 8077 - 9873

Ex Output:

12843