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:
8929 - 6145 + 8551 - 1836 + 9159

Ex Output:
-800


Ex Input:
5462 - 3916 + 9462 - 8867 - 7357

Ex Output:
16140


Ex Input:
8410 - 2163 - 68 + 9818

Ex Output:

823