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: ['j', 's', 'z', 'v', '5401', 'u', '8859', 'i', 'l', 'a', 'p', 'v', 'v', 'o', '3969', '4091', 'y', '6827', '1799', '5163', 'd', 'w', '4795', '5167', 'x', 'q', '2903', '1171', '5279', '449', '7901', 'u']

Output: a, d, i, j, l, o, p, q, s, u, v, w, x, y, z


Input: Consider Input: ['6643', '6757', 'h', '1033', 's', 'c', '2003', 'p', '5483', 'f']

Output: c, f, h, p, s


Input: Consider Input: ['7815', '6065', 'h', '3051', '7437', 'r', 'g', '2065', 'g', 'f', 'n', 'j', '9201']


Output: f, g, h, j, n, r