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:
1649 + 4642 + 613 - 7051 - 8575

Ex Output:
12020


Ex Input:
4117 - 7011 - 9534 - 3901 - 9537 + 6979

Ex Output:
27121


Ex Input:
4810 - 7988 + 5646 + 8226 + 5009 - 1013 + 7246 - 4319 - 1934

Ex Output:

-6063