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:
8974 + 8978 - 8097

Ex Output:
8093


Ex Input:
1943 + 6084 + 8719 + 2400 + 8595 - 7077 + 1264

Ex Output:
-18042


Ex Input:
2121 - 7810 - 6909 + 5584 - 6472 + 2283

Ex Output:

15445