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:
1510 + 8779 + 5742 - 9951 - 2155

Ex Output:
-905


Ex Input:
9001 + 6216 - 1478 + 5475 - 8693 - 3911 - 319 + 4768 - 320

Ex Output:
7263


Ex Input:
2488 - 4609 + 2265 - 7818 + 7919 - 9822 - 5992 + 1431

Ex Output:

19114