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:
556 + 5223 - 5888 + 4866

Ex Output:
-3645


Ex Input:
3126 - 612 - 9485 - 3358 + 8070

Ex Output:
8511


Ex Input:
621 + 1302 - 4116

Ex Output:

3435