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: ['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: ['5761', '2289', '577', 't', '125', 'i', 'g', '9693', '747', 'd', '4829', '9587', 'f', 'k', 'w', 'v', '8607']

A: d, f, g, i, k, t, v, w
****
Q: ['u', '7727', '947', '9641', 'j', '5093', '3681', '9433', '9787', 'p', '7031', 't', '7599', 'v', '1963', '5709', '9359', 'x', '5955', 'k', 'p', 't', '3607', '9329', '6815', '5209', '8813', 'q', 'j', '5301', 'l', '8619', '9525', '8455', '5755', '5483', 's', 'y', 'v', 'k', 'p', 'o']

A:
j, k, l, o, p, q, s, t, u, v, x, y
****