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.

[EX Q]: ['w', 'a', 'm', 'd', '409', 'm', 'v', 's', '7801', 'l', '8551', 'k', '867', 'n', '7731', 'z', '3773', '9137', 'v', 's', 'p', 'p', 'f', 'z', 'g', 'q', 'g', '877', '697', '2057', '8389', '2399', '5263', '2761', '9841', '1781', 'l', '8023']
[EX A]: a, d, f, g, k, l, m, n, p, q, s, v, w, z

[EX Q]: ['v', 'l', 'v', '7673', '8975', 'u', '2471', '4151', '3615', '1139', 'i', 'z', '8833', 'v', '341', 'l', 'n', 'l', 'd', '9207', '1861', '3901', 'a']
[EX A]: a, d, i, l, n, u, v, z

[EX Q]: ['h', '9705', '6607', '3167', '6437', 't', '5093', 'v', 'n', '537', '203', '697', '7969', '6615', '2057', '4445', 't', 'e', '8955', 'w', 'h', 't', 'd', 'f', '8171', 'w', '4347', '339', 'z', '1679', 'q', '8073', 'k', '6809', '47']
[EX A]:
d, e, f, h, k, n, q, t, v, w, z