calculate difference between 2 input values in @app.callback -- 2

The project is working, I just need to add a small change, I have 2 filter values option. That means I can input 1 value in filter 1 and 1 value in filter 2. What I want is I need to add a difference function which will calculate the difference between those 2 values in Python dash code which uses @app.callback. I also have the logic but it is not reflected in the output.