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: ['f', '6817', 'f', 'd', '3835', '3051', 'u', 'l', '7679', 'b', '3931', '1441', 'q', '8675', 's', '5487', 'y', '2279', 'x', 'y', '9513', '2875', '1771', '879', '2927', '3469', 'v', 't', 'k', '9991', '2565', '7345', '973', 'w', 'i', '6105']
Example Output: b, d, f, i, k, l, q, s, t, u, v, w, x, y

Example Input: ['i', '4447', 'g', 'o', 'j', 'p', 'l', 'q', 'o', '8777', 'r', 'v', '961', '6083']
Example Output: g, i, j, l, o, p, q, r, v

Example Input: ['e', 'c', 'x', 'e', 'l', 'w', 'n', 'c', 'b', 'm', '1095', 'j', '5941', 'o', '9745', 'q', 'q', '2681', '6107', '6911', 'i', '6571', 'k', 'x', 't', 'q', 'o', '6955', '9789', '7069', 'r', 'k', '6087', 'g', 's', 's', '2787', '8595', '9807', '6279', '9081', 'm', '6265']
Example Output:
b, c, e, g, i, j, k, l, m, n, o, q, r, s, t, w, x