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:
4331 - 362 - 8646 - 8722 + 6424 + 4083 - 579 + 4561

Ex Output:
7572


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

Ex Output:
-143


Ex Input:
2040 - 3481 - 7847 - 8853 - 2887

Ex Output:

25108