I've encountered this puzzle in the VR-Chat world "Information puzzles⁄信息谜题". It's a puzzle world with different rooms (puzzles) and I'm stuck at the 4th room.
To advance to the next room you have to use the keyboard to type in the solution. The solution has a maximum of 4 letters and the letter "I" is missing from the keyboard.
So half the problem here is figuring out what you have to do. So far I have tried to find letters in the picture and typing them in in alphabetical order (I'm assuming that A->Z means that you have to type them in in alphabetical order). The solution isn't: ADXZ, ADXY, ACDX
In case I've missed crucial information you can download the game on steam for free and enter this world yourself. The solutions to the first three rooms are "6910", "escape", "1469"