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: ['9013', 'e', 'm', 'p', 'k', '161', 'k']
Example Output: e, k, m, p

Example Input: ['h', 'v', 'd', '5475', '5623', '9591', 'y', 'y', 't', '4987', 'i', 'k', 'z', 'b', 'b', 'd', '8691', 't', '5021', 'j', '567', 'f', '3509', 'j', '2693', '7563', 'j', 'x']
Example Output:
b, d, f, h, i, j, k, t, v, x, y, z