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: ['z', 'l', 's', 'f', 'j', 'x', '1125', 'd', '37', '5009', '9187', 'b', '8683', '8841', 'y', '9955', '1571', 'm', '347', '3679', '5797', '2133', 'g', 'u', '9817', '6347', '2067', '1927', '167', '4215', '45', 't', 'd', '6599', '4751', 'g', 'l', 'u', '7881', 's']

Output: b, d, f, g, j, l, m, s, t, u, x, y, z


Input: Consider Input: ['d', 'm', 'k', '3513', '8241', '5541', 'm', 's', '1993', '6163', '2753', 'd', 'b', 'm', 'i', '7647', '8631', '9119', '2165', 'x', '3911', '2769', '1673', '7195', 't', 'w', '5555', 'o', '3265']

Output: b, d, i, k, m, o, s, t, w, x


Input: Consider Input: ['3063', '2905', 'o', 'e', '3385', '7385', 'q', 'p', 'b', 'j', 'n', 'k', '9565', 'w', '4047', '8175', 'x', '7485', '1231', '273']


Output: b, e, j, k, n, o, p, q, w, x