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: ['5957', 'd', 'i', 'b', 'e', '5565', 'c', 'i', '2919']
Example Output: b, c, d, e, i

Example Input: ['y', '8115', 'f', '5333', 'f', '3437', 'b', 'e', '5719', 'm', 'w', '95', '4863', 'k', '4895', 'a', '8179', 'm', '7919', '1731', '229', 'r', '1847', '7559', '6669']
Example Output: a, b, e, f, k, m, r, w, y

Example Input: ['e', '1159', 'c', 'p', 'c', '1713', '825', '6079', '8147', '25', 'l', 'x', '1281', 'p', '4145', '7275', 'u', '411', 'h', 'e', 'x', 'x', 'v', 'k', 's', '1785', '7021']
Example Output:
c, e, h, k, l, p, s, u, v, x