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:
2537 - 3199 + 5925 + 8172 + 3564 + 8810

Ex Output:
-20735


Ex Input:
3561 + 2090 - 1286 - 2259 - 7069 + 5058

Ex Output:
7027


Ex Input:
9155 + 8986 + 6157 + 1837 + 2944 - 2479 - 4637 - 7702 + 7771

Ex Output:

-3722