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: ['s', 's', '6581', 'e', '7355', '1315']
Example Output: e, s

Example Input: ['7071', 'h', '837', 'z', 'c', '2217', 'c', '6341', '6607', 'g', '3569', 'a', 'h', 't', 'b', 'f', 'g', 'f', 'l', 'b', 'x', 'o', 'r', '8949', '8071', '1507', 'v']
Example Output: a, b, c, f, g, h, l, o, r, t, v, x, z

Example Input: ['b', 'a', '5725', '9373', 'y', '6227', 'v', 'q', 'k', '9055', 'd', '273', 'a', '7571', '703', '7159', 'r', 'y', 'j', 'l', '6327', 'o', 't', 's', 'c', '2263', '7561', '5547', '7575', 'd', '4265']
Example Output:
a, b, c, d, j, k, l, o, q, r, s, t, v, y