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:
7525 + 263 - 1634 + 3644 + 6905 - 167

Ex Output:
-1486


Ex Input:
2458 + 4195 - 6382

Ex Output:
4645


Ex Input:
3762 - 1520 - 9999

Ex Output:

15281