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: ['t', 'u', 'y', 'y', 'b', 'x', 'q', '3713', '2679']
Example Output: b, q, t, u, x, y

Example Input: ['u', 'k', 'd', '4393', 'u', 'h', 'q', '833', 'k', 'l', '5749', 'r', '7123', '1003', 'z', '531', 'o', 'u', '6601', '6975', '4905', 'n', 'e']
Example Output: d, e, h, k, l, n, o, q, r, u, z

Example Input: ['a', '8071', 'o', 'k', 'k', 'v', 'i', 'r', '2215', '4117', 'p', '1781', 'o', '7141', '1049', '971', 'o', '7549', 'h', 'd', '3537', 'v', 'r', 'g']
Example Output:
a, d, g, h, i, k, o, p, r, v