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.

Ex Input:
iUdqXEZcsEQG, CfzxXEZcsKxSBZ

Ex Output:
b, c, e, f, k, s, x, z


Ex Input:
BzYuPZCFqN, cdLNwuPZCFfix

Ex Output:
c, d, f, i, l, n, p, u, w, x, z


Ex Input:
zTyJHvbvCdlbuGRMbmutXvWLRgQZYrZ, jFHDQfHvbvCdlbuGRMbmLyqPnAnk

Ex Output:

b, c, d, g, h, j, l, m, q, r, t, u, v, w, x, y, z