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', 'a', 'p', 'p', '4203', '1587', '2953', '9809', '99', '5821', 't', 'i', '4213', '1809', 's', 'l', 'i', 'b', '9233', '3983', '7713', '1807', 'k', 'f', '7825', '5491', 'o', '1347', 'u', 'h', '3967', 'u', 'g', '6775', '1069', '9211', 'i', '3369', 'r']
[A]: a, b, c, f, g, h, i, k, l, o, p, r, s, t, u


[Q]: ['t', 'm', '7071', 'j', '353', 'n', 'a', 'm', '9211', 'i', '9537', 'q', '7669', '869', '8753', '8071', '375', '9971', 'c', 'n', '5851', 'u', '2491', '2697', '2789', '4683', '879', 'q', 'g', 'p', 'd', 'x', 'r', 'i', '8171', '5449', '2477', '1151', 'z', '3845', '1079', 'j', 'n', 'p', '8199']
[A]: a, c, d, g, i, j, m, n, p, q, r, t, u, x, z


[Q]: ['251', '4787', 'd', '2333', 'y', '7573', '5785', '7609', '6407', 't', 'j', '6325', '585', '9071', '8075', '8945', 'i', 's', 'u', '6627', '8805', 'b', '221', '2685', '4315', '187', 'y', '6069', 'a', 'a', 'j', 'b', 's', 'r', 's', '8927', 'n', '7101', '5597', 'm']
[A]:
a, b, d, i, j, m, n, r, s, t, u, y