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:
6091 - 9741 + 8943 + 4033 - 2984 + 4984 + 8503

Ex Output:
-7647


Ex Input:
3171 - 3678 - 3096 - 5842 - 3188

Ex Output:
18975


Ex Input:
6321 - 699 + 5372 + 1640

Ex Output:

8