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:
9301 + 1619 - 7459 + 5871 + 2497 + 4093 + 7957 - 1085 - 6698

Ex Output:
2506


Ex Input:
5473 - 4337 - 6499 - 9119

Ex Output:
25428


Ex Input:
8712 - 5912 + 2490 - 5062 + 4960 + 2866

Ex Output:

9370