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:
5444 + 2542 - 6861 + 2740 - 4508 + 478 - 1138 + 7229

Ex Output:
4962


Ex Input:
6020 + 1977 + 708 + 1899 + 3704

Ex Output:
-2268


Ex Input:
6603 - 5465 + 8513

Ex Output:

3555