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.

Input: Consider Input: 569 + 2078 + 2757 - 9211

Output: 4945


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

Output: 1811


Input: Consider Input: 5751 - 3997 + 8306 + 3339 - 1811 + 2232 + 722 - 5944


Output: 2904