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:
8247 - 6987 - 8915 - 9962

Ex Output:
34111


Ex Input:
4839 - 962 + 7552

Ex Output:
-1751


Ex Input:
3093 - 9410 + 3927 - 4299 - 834

Ex Output:

13709