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:
1229 - 4354 + 912 - 1766

Ex Output:
6437


Ex Input:
2510 - 5839 + 9950 + 740

Ex Output:
-2341


Ex Input:
248 + 2276 + 3243 + 6687 - 3151 + 988

Ex Output:

-9795