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]: ['1931', 'c', 's', '8767', 'z', '8977', '9249', '365', 'p', '7187', 'p', '961', 'k', 'k', '423', '5999', '4697', '6251', '6441', '1821', 's', 's', 'f', '5365', 'z', '5113', 'y', 'k', 'i', '5627', 'u', 'w', '4103', '8035', '7105', 'o', 'n', 's', 'y']
[A]: c, f, i, k, n, o, p, s, u, w, y, z


[Q]: ['v', '3765', '4065', 'a', '4201', 'f', 'x', '9275', 'q', '9303']
[A]: a, f, q, v, x


[Q]: ['o', 'j', 'l', '8929', 'q', '9991', 'v', 'r', 'o', '6135', 'q', 'q', 'j', 's', '7389', 'g', 'x', '4087', 'h', '5061', 'd', '287', '8255', 'p', 'd', '9263', 'n']
[A]:
d, g, h, j, l, n, o, p, q, r, s, v, x