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:
4839 - 962 + 7552

Ex Output:
-1751


Ex Input:
3089 - 6778 - 3604 - 1052 - 1332

Ex Output:
15855


Ex Input:
456 - 2263 - 5502 - 8470

Ex Output:

16691