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: ['l', 'g', 'd', 'p', '8163', '6643', 'o', 'p', 'm']
Example Output: d, g, l, m, o, p

Example Input: ['305', '95', 'e', 'q', 'e', '341', 'u', 'w', '5911', '6851', 's', 'u', '2355', 'd', '4151', 'w', '4421', '1129', '8065', 'k', 'q', '3649']
Example Output: d, e, k, q, s, u, w

Example Input: ['u', '949', 'q', '5109', '7103', '7503', 's', 'k', '1287', 'r', 'a', '5553', '509', 'x', 'b', '7253', 'b', 'n', '7751', '8199', '3411', '5607', 'q', 'u', 'c', 'o', '8537', 'f', '9943', 'e', 'q', '8897', 'm', 'm', 'a', '3763', 'a', 'u', 'h', 't', 'p', '5865', '4867', 'g', '2839']
Example Output:
a, b, c, e, f, g, h, k, m, n, o, p, q, r, s, t, u, x