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: ['7065', 'f', 'k', 'i', 'd', '8291', 'z', 'e', 'q', '5345', 'h', '3397', 's', '5355', 's', '9033', 'e', '5241', '5285', 'm', 'h', 'i', 'n', '6471', '3365', 'f', 'r', '6145', 't', '4869']

Output: d, e, f, h, i, k, m, n, q, r, s, t, z


Input: Consider Input: ['f', '217', '449', 't', 'j', '4097', '5561', '8317', '647', 'u', 'b', '7833', 'r', '9011', 'z', '2753', '2183', 'z', 'o', 'g', '7541', 'b', '8795', '327', 'v', 'e', 't', 'l', '4909', 'k', '7681', 'r']

Output: b, e, f, g, j, k, l, o, r, t, u, v, z


Input: Consider Input: ['y', 'i', 'r', '6349', '9753', 'd', '5079', '5949', '1745', '9319', '1237', '7529', 'h', '3231', 'e', '7253', 'e', '483', '7699', '9381', 't', '3237', '701', '6217', '6767', '221', '297', 'b']


Output: b, d, e, h, i, r, t, y