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: 6439 - 6685 + 6156 - 3314 + 6845 - 6872

Output: 10309


Input: Consider Input: 6603 - 3783 + 3030 - 5787 + 8478 + 3046 - 1629

Output: 3248


Input: Consider Input: 2994 - 4380 + 6720


Output: 654