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:
4397 - 3478 - 9837 - 7164 + 7972 + 3676

Ex Output:
13228


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

Ex Output:
-20735


Ex Input:
7206 - 6571 - 6832 - 6069 + 1883

Ex Output:

24795