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]: ['j', 'y', '9907', 'a', '5715', 'l', '9817', '1949', '2697', '2255', '9571', '8957', '9329', '6055', 'z', 'q', '1185', '4593']
[A]: a, j, l, q, y, z


[Q]: ['8231', 'h', 'a', 's', '7335', 'd', '2359', '5065', 'w', 'q', 'r', '7883', '5669', 'a', 'y', 'u', '9909', 'k', 'p', 'h', '1823', '3589', '835', 'y', 'i', '6305', 'r', 'i', 'o', 'h', '1893', '1419', '6093', '4957', 'r', '6135', 'k', 'i', 'a', '3447', 'l', 'v']
[A]:
a, d, h, i, k, l, o, p, q, r, s, u, v, w, y