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: ['1801', 'q', '5101', '8863', '2309', 'p', '8789', '9529', '6135', '5523', 'f', '8889', '7639', 'k', '263', '5751', '5529', 'g', '1451', '4143', 'e', '6987']
Example Output: e, f, g, k, p, q

Example Input: ['n', 'q', '6461', 's', '8565', '2237', '2071', '8143', '2977', '5511', 'j', 'o', '5793', 'j', 'm', 'n', '8031', 'j', '535', '5001', 's', 'y', '1737']
Example Output: j, m, n, o, q, s, y

Example Input: ['p', '4189', '2049', 'c', 'a', '3817', '7351', '2527', 'v', '3135', 'e', 'j', 'b', 'd', 'u', 'o', 'r', '3623', 'm']
Example Output:
a, b, c, d, e, j, m, o, p, r, u, v