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:
7163 + 3916 + 4926 + 2532 - 2743 - 5389 + 7290

Ex Output:
-3369


Ex Input:
8137 + 5006 - 7743 + 1478

Ex Output:
9396


Ex Input:
4101 + 2536 - 502

Ex Output:

2067