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:
5355 + 1451 - 3895 + 6213 + 743

Ex Output:
843


Ex Input:
8213 + 7145 + 5203 - 2621 + 1654 - 1844

Ex Output:
-1324


Ex Input:
7388 - 3073 - 1891 + 2180 + 1361 - 9381 + 566 - 2665

Ex Output:

20291