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]: ['2459', '3709', 'f', '8673', '9313', 'm', 'd', 'g', 'c', 'g', 'u', 'f', 'p', 'i', '8771', '3613', '9669', '6221', '1211', '8331', '2295', 'b', 'f', 'm', '1377', '9831', '1751', 'k', '4831', 'm', '2747', '3435', '4543', 'c', '1729', 'e', '7093', '397', 'm', '383', '2019']
[A]: b, c, d, e, f, g, i, k, m, p, u


[Q]: ['1657', 'u', '1849', '425', 'v', '6435', 'j', '2985', '921', '9553', '2621', 'i', '7103', 'd', '8563', 'l', 'b', '6727', '4235', 'n', '8021', 'd', 'z', '437', 'm', '5695', 't', '3421', 'e', 'a', '2941', '791', '1417', '9247', 'h']
[A]: a, b, d, e, h, i, j, l, m, n, t, u, v, z


[Q]: ['h', '2291', '8937', 'g', '7299', 'z', '3339', 'g', 'y', '3265', 'f', '6663', 'c', '9281', '1853', '4273', '6933', '7975', 'q', 'm', 't', '3679', '4205', 'r', '2849', 'i', '1857', 'f', 'i', '9601', 'u', 'u']
[A]:
c, f, g, h, i, m, q, r, t, u, y, z