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:
6646 + 4878 - 8881 - 992 + 7276

Ex Output:
4365


Ex Input:
569 + 2078 + 2757 - 9211

Ex Output:
4945


Ex Input:
3421 - 71 + 7643 - 8661 + 520 - 6536 + 9411

Ex Output:

1115