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]: ['i', 's', 'f', 'i', '2293', '245', '4983', 'h', 'h', '6203', '8703', '1613', 'h', 'o', '3635', '8069', '2829', '1939', 'u', 'm', '5305', 'n', 'k', '9367', 'u']
[A]: f, h, i, k, m, n, o, s, u


[Q]: ['6181', 'w', '4663', '5507', 'a', '6607', '869', '2669', 'r', '3629', 'r', 'l', '6599', '8885', 's', '4315', 'z', 'l', 'r', '1225', '8371', '1545', '7169', '1175', 'k', 'p', 'y', '7263', '5537', '8649', '3317', 'q', 'r', 'u', 'd', '4647', 'u', 'y', 'h', '9753', 'q', '725']
[A]: a, d, h, k, l, p, q, r, s, u, w, y, z


[Q]: ['t', 'z', 'b', 'h', '2973', '7333', 'f', 'w', '5473', '6091', 'q', '7661', '971', 'g', '9071', '1265', 'n', '1743', 'y', '4003', 'h', 'o', '5851', 'w', '4555', 'l', 'q']
[A]:
b, f, g, h, l, n, o, q, t, w, y, z