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:
5634 - 7997 + 8248 + 1465 - 3986

Ex Output:
7904


Ex Input:
2039 + 442 - 2380 + 4024

Ex Output:

-47