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.

Input: Consider Input: ['6249', '1235']

Output: -1


Input: Consider Input: ['3223', 'h', 'w', 'f', 'y', '1667', '8843', '8759', '9203', '3305', '3549', '5507', '6251', 't', '8319', '9121', '6643', 'u', '4273', '4429', '7543', '7909', '789', '9183', '5729', 'd', '7063', 'b', '6677', 'w', 'x', 'x', 'z', '769', 'p', 'd', 'h']

Output: b, d, f, h, p, t, u, w, x, y, z


Input: Consider Input: ['5079', 'e', 'u', '3625', '3573', '6187', 'y', '5095', 'q', '4599', 'g', '6419', 'm', 'y', '2277', 'g', 'y', 'p', 'w', '4585', 'm', 'a', '3529', 'v', 'k', 'b', '9575', '7949', '5065', 'x', '3971', 'z', '8785', '5057', 'd', '443']


Output: a, b, d, e, g, k, m, p, q, u, v, w, x, y, z