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]: ['e', 'z', '5199', 'x']
[A]: e, x, z


[Q]: ['r', 'j', '437', 'b', '5223', 'n', 'v', '437', 'd', '8285', 'k', 'j', 'r', 'p', 'n', 'e', 'n', 'j', 'o', '2651', 'j', '6365', 'q', 'q', '2159', 'g', '3641', '7727', 'c', '1197', 's', 't', 'n']
[A]: b, c, d, e, g, j, k, n, o, p, q, r, s, t, v


[Q]: ['6643', 'z', '2321', 'g', '9615', 'e', 'b', 'a', '6305', 's', 'y', 'l', 'v', 'c', '5183', 'm', 'p']
[A]:
a, b, c, e, g, l, m, p, s, v, y, z