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: ['4927', 'h', 'x', '4719', 'j', 'f', '7797', 'l', 'i', 'q', 'x', 'i', 'k', '3215', 'k', '1625', 'g', 't', 'i', 'w', 'n', '6659', '8355', '831', 'h', '9723']
Example Output: f, g, h, i, j, k, l, n, q, t, w, x

Example Input: ['8311', 'w', 'f', '3431', '9863', '5817', '3969', '2705', 'x', 'm', 'k', 'z', 'z', '235', 'x', '417', 's', 'i', 'y', '8833', '8675', 's', 'm', '2149', '765', 'u', '1021', '7823', 'x', '7275', '3157', 'k']
Example Output: f, i, k, m, s, u, w, x, y, z

Example Input: ['4835', '9357', '2035', '9225', 'w', '6729', '5413', 'l', 'h', '8977', '1677', '2557', 'h', 'm', '1557', '8979', 'e', '2833', '7361', 'n', 'g', 'g', '9353']
Example Output:
e, g, h, l, m, n, w