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: ['7441', '7967', '2011', '1383', 'i', '3623', 'b', 'y', 'e', '1593', 'r', 'a', 'd', 'b', '6159', '3931', '989', '435', 'o', 'y', 'j', 'w', '7669', 'y', '5781', 'u', '531', '7467', '3971', '8139', 'w', 'a', '5113', '9461', '8377', '7431', '6975', '6055', '7307', 'v']
Example Output: a, b, d, e, i, j, o, r, u, v, w, y

Example Input: ['i', 's', 'f', 'i', '2293', '245', '4983', 'h', 'h', '6203', '8703', '1613', 'h', 'o', '3635', '8069', '2829', '1939', 'u', 'm', '5305', 'n', 'k', '9367', 'u']
Example Output: f, h, i, k, m, n, o, s, u

Example Input: ['z', 't', 'v', 'r', '539', '2775', 'p', '8559', 'n', 'c', '981', '5505', '2291', 'c', 'l', 'i', '3715', '4977', 'd', 'l', 'j', 'v', '2349', 't', 's', '6621', 'n', 'k', 'm', '4371', '5001', 's', '6941', 'b', 'n', 'a', 'c']
Example Output:
a, b, c, d, i, j, k, l, m, n, p, r, s, t, v, z