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:
1229 - 4354 + 912 - 1766

Ex Output:
6437


Ex Input:
86 - 2166 - 8519 - 7184 - 362 - 2203 + 1579 - 1133 + 3978

Ex Output:
16096


Ex Input:
7420 + 6019 - 2881 + 7781

Ex Output:

-3499