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: 6570 + 2902 + 9219 - 6971 + 6886 + 765

Output: -6231


Input: Consider Input: 8213 + 7145 + 5203 - 2621 + 1654 - 1844

Output: -1324


Input: Consider Input: 2987 + 2214 + 5715 - 1543


Output: -3399