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:
8171 + 8357 + 171 - 3129 - 6929

Ex Output:
9701


Ex Input:
1540 + 6977 + 9400 - 5524 - 1970 + 8397 - 6006 + 3183

Ex Output:
-12917


Ex Input:
7671 - 2300 - 9650 - 6692 + 7656 + 4940 - 2878 - 5602 + 7222

Ex Output:

14975