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:
CSesHHtSaeitMeIkPWMkkk, wYoJGHHtSaeitMeIaKnGSkEMRM

Ex Output:
a, e, g, h, i, j, k, m, n, o, r, s, t, w, y


Ex Input:
rNlBhzIxnsPYKC, IydqSjhzIxnsfBwo

Ex Output:
b, d, f, h, i, j, n, o, q, s, w, x, y, z


Ex Input:
AvAyeDfUrUsnfCxUbosSwMtOsvXHL, BBfUrUsnfCxUboxZYHd

Ex Output:

a, b, c, d, e, f, h, l, m, n, o, r, s, t, u, v, w, x, y