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.

Input: Consider Input: AjFwxWQCKWaRDp, BXOUxWQCKWabWlbxE

Output: a, b, c, e, k, l, o, q, u, w, x


Input: Consider Input: juQeDwzqshVbjYZTsVuAvKcnzqPYqTv, vERjshVbjYZTsVuAGn

Output: a, b, c, d, e, h, j, k, n, p, q, s, t, u, v, w, y, z


Input: Consider Input: SLmSZucPSdafCPwttbBRkpMVqWK, fKrducPSdafCPwttbEB


Output: a, b, c, d, f, k, l, m, p, q, r, s, t, u, v, w, z