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:
8137 + 5006 - 7743 + 1478

Ex Output:
9396


Ex Input:
6439 - 6685 + 6156 - 3314 + 6845 - 6872

Ex Output:
10309


Ex Input:
8422 + 5670 - 5825 + 3613

Ex Output:

4964