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:
8171 + 8357 + 171 - 3129 - 6929

Ex Output:
9701


Ex Input:
8571 - 5985 + 8912

Ex Output:
5644


Ex Input:
1049 + 7727 + 6641 + 973 + 5220 + 9741 - 2153

Ex Output:

-27100