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: ['8381', 'j', '761', '5431', '7601', 'd', '4339', '1479', 'b', 'x', 'f', 'w', '2437', '7725', '6385', '411', 'w', 'w', 'i', '2769', '5709', '5703', 'k', '5301', '6503', '7833', 'y', '3813', '7061', '5531', 'n', '2251', 'y', '8941', '8481', 's', 't', 't', '3345', 'k', '1545']
Example Output: b, d, f, i, j, k, n, s, t, w, x, y

Example Input: ['9925', 'f', '6149', 's', 'd', 's', '75', '8577', '2319', 'b', '3769', '5211', 'q', 'm', '8127', 'f', '3801']
Example Output: b, d, f, m, q, s

Example Input: ['a', '8769', '5365', 'e', 'h', 'a', '8455', 'o', 'f', 'f', '4637', 'n', '7247', 'a', 'f', '8647', '4975', 'j', 'n', 'f', '1623', 'j', '927', '2649', '9115', '7347', '7355', '3497', 'u', 'd', '6433', '9839']
Example Output:
a, d, e, f, h, j, n, o, u