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.

['7071', 'h', '837', 'z', 'c', '2217', 'c', '6341', '6607', 'g', '3569', 'a', 'h', 't', 'b', 'f', 'g', 'f', 'l', 'b', 'x', 'o', 'r', '8949', '8071', '1507', 'v']
a, b, c, f, g, h, l, o, r, t, v, x, z

['d', 'p', 'k', '9679', 'x', 'j', '7481', '1815', 't', 'w', '6513', 'j', '5079', '5219', 'p', '9545', 'a', '1931', '9973', '8125', '5169', '2791', 't', 'd', '2057', 'e', 'x', 'y', '7409', 'u']
a, d, e, j, k, p, t, u, w, x, y

['e', '7223', 'u', '1129', 'l', '3999', '6685', '5571', 's', 'o', '9309', 'l', 'q', '2329', '2351', 'e', '5031', '5703', 'n']

e, l, n, o, q, s, u