The trick is...
Look at #s 9, 18, 27, 36, etc. letter near them is the
same.
Look what the letter near #9 is. Say it's "I".
Now in the "magic"
box there will be letter "I"
Restart.
Now look at a letter near #9. It's different. Say it's "J".
So in the "magic"
box it will be letter "J"
Who's the man?
--> Kid right here <---