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:
2167 - 8760 - 4771 - 8633 + 7929 + 9784 + 6892

Ex Output:
-274


Ex Input:
1656 - 2355 + 4098 + 8586 + 7634 + 9427 + 9429

Ex Output:
-35163


Ex Input:
6490 + 4620 + 8708

Ex Output:

-6838