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:
5355 + 1451 - 3895 + 6213 + 743

Ex Output:
843


Ex Input:
8974 + 8978 - 8097

Ex Output:
8093


Ex Input:
9625 - 1139 - 9303

Ex Output:

20067