In this task, you are given two strings A,B. Find the longer of the two lists, convert it to lowercase, and return all the unique alphabets used in it. The two input strings are never equal.

Example Input: trULSxQVOWundZkcosFsM, uIsfTLbQVOWundZzns
Example Output: c, d, f, k, l, m, n, o, q, r, s, t, u, v, w, x, z

Example Input: LRDbYRQSUqRyMzZQKIRNEbbA, JbGFgQSUqRyMzZQKIRNEQbvTw
Example Output: b, e, f, g, i, j, k, m, n, q, r, s, t, u, v, w, y, z

Example Input: UmFSDvYUQIMejNjQeFSG, YlhannYUQIMejCxpjln
Example Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
d, e, f, g, i, j, m, n, q, s, u, v, y

