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: ['t', 'a', '2481', '2841', 'a', '2871', 'm', '4435', 'g', '8201', '4351', '9045', 'o']
Example Output: a, g, m, o, t

Example Input: ['r', '9489', 'e', 'n', '6323', 'd', '3163', '265', '8587', '7891']
Example Output: d, e, n, r

Example Input: ['q', '1051', '4751', '5273', '2917', '5875', '4713', 't', '1337', '7321', '9169', 'y', 'h', 'w', 'j']
Example Output:
h, j, q, t, w, y