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: ['57', 'j', 'n', '877', 'u', 'w', 'j', 'f', '8977', 'h', '469', '9417']
Example Output: f, h, j, n, u, w

Example Input: ['u', '9249', 'u', 't', 'm', 'm', 'n', 'w', '8617', '2729', 'i', 'l', '2971', '3227', 'b', '9017', '4711', 'i', 't', 'r', 'a', 'a', '1701', '6397', '4535', '9167', '6039', '6111', '849', 'p', '8197', '2645', '5147', 'u', 'l', '7419', 'w', 'w', 'k', 'x', 'c', '3377', '4015', '1297', 'f']
Example Output: a, b, c, f, i, k, l, m, n, p, r, t, u, w, x

Example Input: ['v', 'o', '2061', '8697', '4883', 'd', '4505', '4421', 'i', 'r', '2905', 'u', 'v', 'p', '257', '8469', '4533', 'v', '5413', 'a', '1883', '401', 'm', 't', 'n', '9337', 'w', 'g', '1285', '1691', '3647', '5999', 'e', 'b', '2487', '3827', '7651', '391', 'm', '8287']
Example Output:
a, b, d, e, g, i, m, n, o, p, r, t, u, v, w