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:
2297 + 4208 + 9691 - 6995 + 738 + 1245 - 7806

Ex Output:
1216


Ex Input:
5371 + 2365 + 9586 - 6312 - 8369 - 7840 - 1823

Ex Output:
17764


Ex Input:
6454 + 5519 + 1871

Ex Output:

-936