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: ['r', '4655', 'm', 'l', '4371', 'o', '5331', '5469', 'j', 'u', '4915', 'v', 'i', 'f', 'j', '6139', 'y', '2423', '1271', '2289', '5565', '7561', '9697', 'e', 's', 'u', '9581', 'y', '6095', '5047', '625', '9047', 'd', 's', '8307', '3615', '8145']
Example Output: d, e, f, i, j, l, m, o, r, s, u, v, y

Example Input: ['8975', '7199']
Example Output: -1

Example Input: ['t', '7347', 'a', '5803', 'v', '4125', '3125', '7283', '3397', '3587', '2419', 'h', '9783', '5933', 'r', 't', '1583', 'x', '8559', 'p', '37', '4923', '1409', 'g', '5465', '1649', 'o', '7217', '7233', '9593', '9661', '6663', '5865', '3427', 'n', 'o', '2451', 'l', '9781']
Example Output:
a, g, h, l, n, o, p, r, t, v, x