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: ['9223', 'w', '8631', '4453', '9975', 'y', '9747', 'g', '7077', '2593', '6015', 'n', '7345', 'i', '7807', '299', 'q', '3629', '2545', 'k', 'm', 'q', '5155', '5633', 'x', 'q', 'i', '27', 'f', '7919', 'p', '4835']
Example Output: f, g, i, k, m, n, p, q, w, x, y

Example Input: ['9627', '9879', '5421', '4755', '1533', '6727', 't', '7641', 'd', '3929', 'h', '3989', '8441', 'k', 'p', '2653', 'm', 'b', 'i', '3431', '4907', '5687', 'g', 'h', '9185', '5051', 'k', '7135', '709']
Example Output: b, d, g, h, i, k, m, p, t

Example Input: ['8935', '7797', 'j', 'g', 's', '605', 'y', 't', 'y', 'r', 'n', '895', '605', 'v', 's', 'r', 'q', 'y', '2321', 't', 'g', 'q', 'q', 'm', 'x', 'x', 'b', '2985', '6955', 'p', '9691', 'f', '3519', 'l', '8115', '1515', '895', 'o', '8701', 'n', 'd', 'w', 'r', 'l']
Example Output:
b, d, f, g, j, l, m, n, o, p, q, r, s, t, v, w, x, y