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:
4224 + 9155 + 116 - 5148 - 7166 - 7397 - 3883 - 2139

Ex Output:
20686


Ex Input:
8737 - 2978 - 6717

Ex Output:
18432


Ex Input:
8816 + 9040 + 8637 + 1960

Ex Output:

-10821