Ace has always been good with puzzles.

↓ Transcript
Captain: It has to be here somewhere. Oh, hello, Ace. Waiting for your mother?
Ace: Yes, sir, Captain Miles.
Captain: What are you working on there?

Ace: I found a puzzle to do. It isn't very hard, though.
Captain: Good lad! Look under the desks.

Ace: Can I help? What are you looking for?
Captain: We're missing a copy of an encrypted intercept. It's a sheet of paper with a bunch of numbers on it. They mean something when decoded. Looks sort of like a number-.

Captain: Puzzle?!
Ace: Oh, I'm sorry. Did you want to solve it?