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:
8433 + 1618 + 9022 - 2431 - 8097 + 8068

Ex Output:
253


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

Ex Output:
17764


Ex Input:
1199 + 5620 - 3468

Ex Output:

-953