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:
2977 - 4470 - 76 + 164 + 8433 - 2054 - 4953

Ex Output:
5933


Ex Input:
5270 - 8957 + 6318 - 3390

Ex Output:
11299


Ex Input:
788 + 3289 - 3052 + 5397

Ex Output:

-4846