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.

[Q]: ['c', '6027', 'o', 'h', 'l', '7893', 'u', 'f', '7661', '4715', '1373', '4799', 'd', 'z', '411', '4753', 'd', '8241', '1589', '4173', '3921', 'j', 'o', '5067', '8879', 'e', 'm', '9543', '9625', '855', 'u', 'd', '5859', '4243', '5747', '5147', '7315', 'd', 'x', 'q', '7841', '7397', 'm']
[A]: c, d, e, f, h, j, l, m, o, q, u, x, z


[Q]: ['a', '533', '67', 'z', 'z', '9283', 'o', 'a', '7045', '1521', 'm', 'h', 'q', '4173', '7497', '319', '5721', '6097', 'i', '9829', '1801', '7347', 'r', 'z', '239', '4279', 'e', 'k', 'r', 'v', '6653', '599', '8597', 'd', 'r']
[A]: a, d, e, h, i, k, m, o, q, r, v, z


[Q]: ['3611', '6141', 'g', '2217', '1121', '3359', '5837', 'r', '9609', 'v', '3331', '5019', 's', 'g', '5293', 'c', 'n', '9745', 'd', '7135', 'r', '2379', '7021', 'n']
[A]:
c, d, g, n, r, s, v