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:
8155 + 6800 - 6839 - 8047 + 3270

Ex Output:
12971


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

Ex Output:
-12917


Ex Input:
4913 + 1099 + 4463 + 5165 + 5527

Ex Output:

-11341