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: ['6737', 'g', '9985', '5257', 'k', 't', '7863', 'y', '8319', 'l', 'o', '6505', '6531', 'z', '3055', '2943', '3625', 'h', '4867']
Example Output: g, h, k, l, o, t, y, z

Example Input: ['2349', 'p', 'a', '435', 'y', 'h', '3249', 'o']
Example Output: a, h, o, p, y

Example Input: ['8833', '1437', 'h', 'j', '4703', 'm', 't', '6913', 't', 'j', 'a', '3341', '4215', 'p', '7191', 'h', '1129', '2113', 'g', 'n', 'd', '9225', 'h', '2617', 'n', 'z', '7419', '4859', '1561', 'u', 'e', '3049', '8189', '1771', '1849', 'x', '6401']
Example Output:
a, d, e, g, h, j, m, n, p, t, u, x, z