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: ['4041', 'l', 'g', '9571', '9295', '1395', 'l', 'p', 'f', 'w', 'g', '1721', '2421', 'w', 'z', '2235', 'p', '7851']

A: f, g, l, p, w, z
****
Q: ['7417', '2597', '2633', '7721', 'v', 'l', 'p', '4389', 'l', '3965', '6279', 'm', 'v', 'o', 'd', 'o', 'h', 'd', 'r', 'e', '8993', '2711', 'o', 'q', '1399', 'i']

A: d, e, h, i, l, m, o, p, q, r, v
****
Q: ['4885', 'k', '6215', '8553', 'i', 'u', 'l', 't', 'q', '2977', '9237', 's', 'r', '7205', 'b', '5685', 'f', '631', '709', '1319', 'd', 'c', '9053', '9395', 'q', '843', '8547', 'w', 'k', 'y', 'y', '9821', 'k', 'n', '1367', '4657', 'c', '319', '2617', '4303', 'x', 'd', 'm', '3739', '5079']

A:
b, c, d, f, i, k, l, m, n, q, r, s, t, u, w, x, y
****