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:
1163 - 3809 + 5176 - 2533 + 4885 - 8890 - 506 + 5874

Ex Output:
966


Ex Input:
8974 + 8978 - 8097

Ex Output:
8093


Ex Input:
573 - 2172 + 3067 + 6526 - 4690

Ex Output:

-2158