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:
8213 + 7145 + 5203 - 2621 + 1654 - 1844

Ex Output:
-1324


Ex Input:
1185 - 6431 + 1326 - 2840 - 9276

Ex Output:
18406


Ex Input:
5127 - 175 + 5539

Ex Output:

-237