works on the left alt, now I get 2 of the code, by pressing alt-one of them is correct, on the right 2 also shows the code but both are wrong, the same problem exists when pressing the print screen.
if I press left alt then the output I get:
Alt
Unknown keyCode: 0x0
if i press right alt then the output I get:
Unknown keyCode: 0x0
Unknown keyCode: 0x0
I guess it's codes of pressing and releasing the alt button, when pressed, for example on d button I get:
D d
D