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:
4515 - 2156 - 8427 - 2175

Ex Output:
17273


Ex Input:
7344 + 9206 + 3989 + 5648 - 7620

Ex Output:
-3879


Ex Input:
4324 - 426 - 9171 - 980 + 9454 + 9720 - 7367 - 9266 - 1237

Ex Output:

13597