instruction:
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.
question:
TLskCcrE, gIKskCPoJ
answer:
c, g, i, j, k, o, p, s


question:
fFuWuTTIjTavcwXWlFEoRqtxQqhTZvNX, ZBYeUFDdalXWTTIjTavcwXWlFEobzYyJAwlDyeF
answer:
a, b, c, d, e, f, i, j, l, o, t, u, v, w, x, y, z


question:
kXZfIRvpeLuR, OvztfEZfIRvpXV
answer:

e, f, i, o, p, r, t, v, x, z