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:
3844 - 5783 + 7487

Ex Output:
2140


Ex Input:
6178 - 1637 - 8197 - 6437 + 4591 - 6995 + 3562 + 9474

Ex Output:
11817


Ex Input:
7402 - 2546 - 9891 - 337 + 7679

Ex Output:

12497