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:
1123 - 8657 + 3476 - 5278 + 717 - 1557 + 6614 + 1549

Ex Output:
4259


Ex Input:
2078 + 3891 + 2060

Ex Output:
-3873


Ex Input:
8481 - 8455 + 2538

Ex Output:

14398