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]: ['4925', 'i', 'q', 'k', '7615', 'r', '7217', 'o', '8097', '9151']
[EX A]: i, k, o, q, r

[EX Q]: ['d', 'g', '9019', '9987', '8713', '9513', 'a', '2043', 'd', '5817', 'w', 'd']
[EX A]: a, d, g, w

[EX Q]: ['1789', 's', '1273', '7099', '2553', 'v', '5737', 'p', 'i', '4193', 'm', '2679', '7185', '2043', 'p', '5853', '6843', 'y', 'x', '5699', '8957', 'j', 'f', '6441', '2931', 'u', '4369', 'g', '7459', 'e', 't', '8903', 'h', '2143', 'n', 'o']
[EX A]:
e, f, g, h, i, j, m, n, o, p, s, t, u, v, x, y