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:
5979 - 9772 + 7332

Ex Output:
8419


Ex Input:
415 + 583 + 9979 - 8989 - 4507

Ex Output:

3349