The numerotated grading should only be one of the available gradings, with explanations as to why it's not recommended.
It was convenient (less typing) for the Chat commands. (such as
A2 B4 C3)
Perhaps we can still use letters for the candidates, and receive chat commands with textual grades, like
A Poor B Good C Passable.
The grading ought to be provided to each participant, somehow.
For SMS participation, as @guhur suggested we could perhaps send an SMS in response to any received SMS, with the poll details (question, grading, candidates), and a confirmation that it worked if a command has been parsed.
Deleting a branch is permanent. It CANNOT be undone. Continue?