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:
6570 + 2902 + 9219 - 6971 + 6886 + 765

Ex Output:
-6231


Ex Input:
4331 - 362 - 8646 - 8722 + 6424 + 4083 - 579 + 4561

Ex Output:
7572


Ex Input:
4942 - 9527 + 6353 + 7003

Ex Output:

1113