In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.

['u', 'k', 'd', '4393', 'u', 'h', 'q', '833', 'k', 'l', '5749', 'r', '7123', '1003', 'z', '531', 'o', 'u', '6601', '6975', '4905', 'n', 'e']
d, e, h, k, l, n, o, q, r, u, z

['a', '3281', '9123', '5443', 'w', 'w', 'p', '9275', 'v', 'm', '3549', 'l', 'y', 'l']
a, l, m, p, v, w, y

['l', '9881', 'f', '967', 'f', '1649', '7289', 'p', '3213', '9549', '4013', '369', 'u', 'q', '5067', 'm', 'd', 'd', '9599', 'u', '7545', '4693']

d, f, l, m, p, q, u