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.

Input: Consider Input: ['491', '229', 'g', '6677', '4793', 'h', 'x', 'a', '2333', 'u', 'l', '785', 'p', '7331', '653', '5193', '5415', '8417', 'v']

Output: a, g, h, l, p, u, v, x


Input: Consider Input: ['8381', 'j', '761', '5431', '7601', 'd', '4339', '1479', 'b', 'x', 'f', 'w', '2437', '7725', '6385', '411', 'w', 'w', 'i', '2769', '5709', '5703', 'k', '5301', '6503', '7833', 'y', '3813', '7061', '5531', 'n', '2251', 'y', '8941', '8481', 's', 't', 't', '3345', 'k', '1545']

Output: b, d, f, i, j, k, n, s, t, w, x, y


Input: Consider Input: ['w', '9169', '8123', '4833', 'd', '9345', 'k', 'f', '5585', 'm', 'l', '805', '3009', '4769', 'g', 'q', '2067', 'i', 'g', '1045', '4511', 'z', '3727', '577', 'w', '7697', '8127', 'a', '2949', '7173', '2409', 'a']


Output: a, d, f, g, i, k, l, m, q, w, z