The Secret Alphabet

Every wizard's name hides a mini-alphabet: its different letters, in order. 🧙

You get a lowercase name. Print its unique letters, sorted alphabetically, glued into one string.

Example:

Input: name = "merlin" Output: eilmnr

set(name) collapses to the unique letters {m, e, r, l, i, n}, and sorting them alphabetically spells eilmnr.