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:
6567 + 2835 + 6725

Ex Output:
-2993


Ex Input:
8341 + 2746 - 2959 - 9678 + 5173 + 317

Ex Output:
12742


Ex Input:
8547 + 3893 - 9632 + 5153 + 7061 - 4215 + 4950 - 9684

Ex Output:

11021