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:
9491 + 8647 - 4571 + 8815 - 4816 - 8552 + 1794

Ex Output:
8174


Ex Input:
8135 - 2883 + 7793 - 4176

Ex Output:
7401


Ex Input:
1543 - 7632 + 712 - 8361 - 6170 - 2360 - 8859

Ex Output:

34213