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 - 7166 - 3524 + 2770 + 767 - 3629 - 7894

Ex Output:
26889


Ex Input:
155 + 7497 + 4675 - 2329 - 9080 - 5510 - 2336 + 8701

Ex Output:
-1463


Ex Input:
4229 - 227 - 9550 - 873 - 5875 - 6907

Ex Output:

27661