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:
4899 + 5775 - 8386 + 4273

Ex Output:
3237


Ex Input:
6054 - 4121 + 5615

Ex Output:
4560


Ex Input:
4159 - 1446 - 7212 + 3157

Ex Output:

9660