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:
3238 + 2914 + 4122

Ex Output:
-3798


Ex Input:
573 - 2172 + 3067 + 6526 - 4690

Ex Output:
-2158


Ex Input:
435 - 2203 - 832 - 1041 - 7306 - 8925

Ex Output:

20742