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: 3709 + 206 - 4363 + 3129 + 2506

Output: 2231


Input: Consider Input: 5778 + 1647 - 2800 + 3747 + 3449 + 90 - 2891 + 685

Output: 1851


Input: Consider Input: 1510 + 8779 + 5742 - 9951 - 2155


Output: -905