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:
7298 + 5069 + 5167 + 9387 - 6886

Ex Output:
-5439


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

Ex Output:
10309


Ex Input:
1504 + 8375 + 7903

Ex Output:

-14774