Every time Katya enters the elevator, she sees the reflection of the floor number in the mirror.

The floor number is displayed on a panel, which shows the digits as shown in the picture.

Because the floor number is visible in the mirror, its reflection is reversed with respect to the vertical axis: the order of the digits is reversed and the digits appear as their reflections. However, if a digit $$$x$$$ after reflection completely coincides with another digit $$$y$$$, the brain perceives it as $$$y$$$. But if it does not match any other digit, despite being reflected, the brain perceives $$$x$$$ as $$$x$$$.

What number will Katya see when she enters the elevator, if it is known that she lives on the $$$k$$$-th floor.