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: ['i', '1191', '5581', '2527', 'g', '9795', '519', 'u', '8389', '9793', 'k', '5733', '7125', '7835', 'j', '855', 'd', 'd', '6555', '3211', 'l', 'o', 'b', '523', 'x', 'j', '1707', '4161', '7171', 'h', 'h', 'm', 'h', '2443', 'e', '649', '951', 'n', 'h']
Example Output: b, d, e, g, h, i, j, k, l, m, n, o, u, x

Example Input: ['9273', '5219', 'e', '9413', 'v', 'h', '5657', '797', '2303', '2119', '4791', '2757', '4983', 'h', '9681', '4503', '6657', 't', 'i', 'g', '9375', '9901', 'm', 'y', '6461', 'h', '6663', '9493', '5897', '8829', 'd', 'x', '901', '833', 'u']
Example Output: d, e, g, h, i, m, t, u, v, x, y

Example Input: ['z', 'p', '3801', '6211', 'x', 'n', '3901', '3155', '4401', 'h', 'y', '9489', 'e', 'l', '3537', '177', '8085', '6729', 'k', 'w', 'a', 'k', 'r', 'e', 'k', '2181', '6187', 'y', 't', '4659', 'x', 'y', '3607', '9945', '923', '5055', '5893', 'k']
Example Output:
a, e, h, k, l, n, p, r, t, w, x, y, z