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.

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

Example Input: ['c', 'a', 'p', 'p', '4203', '1587', '2953', '9809', '99', '5821', 't', 'i', '4213', '1809', 's', 'l', 'i', 'b', '9233', '3983', '7713', '1807', 'k', 'f', '7825', '5491', 'o', '1347', 'u', 'h', '3967', 'u', 'g', '6775', '1069', '9211', 'i', '3369', 'r']
Example Output: a, b, c, f, g, h, i, k, l, o, p, r, s, t, u

Example Input: ['s', 'f', 'd', 'x', 'j', '445', '3345', '1379', '823', 'h', '3607', '6811', 'w', 'n']
Example Output:
d, f, h, j, n, s, w, x