[hunter2_]

When removing extraneous modifiers, it takes the form of "[article] [subject]" -- "A thanks."

Similar constructions would be "A cucumber." "The house."

It's a fragment, not a complete sentence, because it lacks a predicate. Had GP included the word "goes" as discussed, it would've created a predicate.

> predicates are a necessary part of English sentence structure [0]

[0] https://www.grammarly.com/blog/predicate/