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:
6439 - 6685 + 6156 - 3314 + 6845 - 6872

Ex Output:
10309


Ex Input:
5773 - 2989 + 8993 + 6702 + 2237 - 1402 - 4236 - 1857

Ex Output:
-1675


Ex Input:
6687 + 8847 + 7854 + 7251

Ex Output:

-17265