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: ['w', 'g', '1649', 'a', '2115', '6763', 'r', 't', 'l', 's', 'y', '5659', 'a', 'b']
Example Output: a, b, g, l, r, s, t, w, y

Example Input: ['4787', 'c', '1727', '9863', '8147', '3931', 'b', '1133', '3023', '7427', '7837', 'n', '7921', 'o', 'c', '3973', '1949', 'x', 'g', 'b', 'd', '8559', '8661', '4465', 'z', '369', 'q', 'e', 'y', '8629', '7665', 'i', 'r', 'n', 'z', '9115', '1393', '4899']
Example Output: b, c, d, e, g, i, n, o, q, r, x, y, z

Example Input: ['w', 'c', '2741', 'k', '6181', 'h', 'o', 'h', 'l', 'c', 'c', '9619', 'l', '7075', 'y', 'j', '635', '9603', 'x', '6531', 'g', 'm', 't', 'j', '9803', 'g', '517', 'o', 't', '4295', 'c', 'a', 'x', '93', '5805', '1725', 'k', '1975', '2081']
Example Output:
a, c, g, h, j, k, l, m, o, t, w, x, y