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: QNMVnAi, wFMVEv

Output: a, i, m, n, q, v


Input: Consider Input: BslLdnmWEnblQZOoYYFYEOSSuRDon, SmAsYvKjqAWxxnblQZOoYYFYEOSSzqhFfzmYL

Output: a, b, e, f, h, j, k, l, m, n, o, q, s, v, w, x, y, z


Input: Consider Input: jqLKLTIQMJkUSfUEGJficE, cEJkUSfUEGJPasSRcP


Output: c, e, f, g, i, j, k, l, m, q, s, t, u