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:
3915 + 4904 + 4887 + 7162 - 3798 + 233 + 1101 - 7758 - 4627

Ex Output:
1811


Ex Input:
2875 - 138 + 917 + 4037 - 6642

Ex Output:
4701


Ex Input:
3078 - 3628 + 6837 - 4184 + 2464 - 5104 + 9205

Ex Output:

-2512