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:
6433 + 6891 + 2386 - 7923 - 2419 + 7641

Ex Output:
-143


Ex Input:
3586 - 8301 + 9044 + 6100 - 8837 + 8230 + 7670 - 8406

Ex Output:
-1914


Ex Input:
58 - 3893 - 4545 - 6541

Ex Output:

15037