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: ['477', '3931', 'g', '5967', 'm', '9845', '1607', 'a', '1749', 'k', 'j', '7945', '9125', 'v', 'n', 's', '5185', '1117', '17', 'x', '4149']
Example Output: a, g, j, k, m, n, s, v, x

Example Input: ['5489', 'f', '6833', 's', 'c', '6575', 'w', '2957', '8465', 'v', 'h', '2119', '7731', 'e', '5367', 'e', '3357', 'p', '7565', 'n', 'x', 'n', 'f', '1075', '5941', '6505', 'j', 'p', '2853', 'l', 'q', '4727', 's']
Example Output: c, e, f, h, j, l, n, p, q, s, v, w, x

Example Input: ['8703', 'b', 'y', 'z', '1153', 'w', 's', 'g', 'q', 'e', '2559', 'h', 'i', '3787', '7645', 'q', 'm', '9173']
Example Output:
b, e, g, h, i, m, q, s, w, y, z