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: ['4927', 'h', 'x', '4719', 'j', 'f', '7797', 'l', 'i', 'q', 'x', 'i', 'k', '3215', 'k', '1625', 'g', 't', 'i', 'w', 'n', '6659', '8355', '831', 'h', '9723']
Example Output: f, g, h, i, j, k, l, n, q, t, w, x

Example Input: ['7417', '2597', '2633', '7721', 'v', 'l', 'p', '4389', 'l', '3965', '6279', 'm', 'v', 'o', 'd', 'o', 'h', 'd', 'r', 'e', '8993', '2711', 'o', 'q', '1399', 'i']
Example Output: d, e, h, i, l, m, o, p, q, r, v

Example Input: ['d', '8293', 'e', 'd', 'b', 'p', '8453', '4969', 'f', 'g', 'h', 'n', '9107', '915', '7807', 'c', 'a', '11', '2685', '3687', '1221', '3073', '4815', '1575', '5633', 'd', '7853', 'c', '2283', '2639', 'y', 'z', '4113', 'y', '2201', '3509', '1947', '917', 'u', '8713', 'o', 'm', '2087']
Example Output:
a, b, c, d, e, f, g, h, m, n, o, p, u, y, z