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: ['7591', '7521', 'm', '1429', 'x']
Example Output: m, x

Example Input: ['v', '3765', '4065', 'a', '4201', 'f', 'x', '9275', 'q', '9303']
Example Output: a, f, q, v, x

Example Input: ['r', '1047', 'j', 'j', 'h', 'o', '4575', '4805', 'd', 'w', 'n', '6563', 'p', '7989', '6469', 'z', '1131', '4285', '379', 'q', 'o', '9167', '7843', 'w', 'i', 's', '1295', '5483', 'd', '4341', '6105', 'r', 't', '3217', 'b', 'w', 'l', '8457', '3773']
Example Output:
b, d, h, i, j, l, n, o, p, q, r, s, t, w, z

