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: ['8451', 'x', '9965', '9303', 'm', 'f', '4205', 'y', 'n', '8521', '9995', 'z', 's', '3519', 'k', 'e', 'o', 'k', '9611', 'q', 'l', 'p', '3339', '4023', 'n', 'd', '8903', 'a', 'k', 'u', '4009', 'e', 'm', '989', '4495']
Example Output: a, d, e, f, k, l, m, n, o, p, q, s, u, x, y, z

Example Input: ['6181', 'w', '4663', '5507', 'a', '6607', '869', '2669', 'r', '3629', 'r', 'l', '6599', '8885', 's', '4315', 'z', 'l', 'r', '1225', '8371', '1545', '7169', '1175', 'k', 'p', 'y', '7263', '5537', '8649', '3317', 'q', 'r', 'u', 'd', '4647', 'u', 'y', 'h', '9753', 'q', '725']
Example Output: a, d, h, k, l, p, q, r, s, u, w, y, z

Example Input: ['z', '8083', '2409', 'c', '9141', '1833', 'j', '8045', '5305', 'e', '1975', '8113', 'o', '6709', '6811', 'l', 'o', 'u', '3369', 'm', 'f', '187', '5753', 'q', 'f', '873', 'h', '371', 'x', 'u', 'z', '9841', 'v', '4065', '3617', 'x', '9067', '3637', 'y', 'q', 'h']
Example Output:
c, e, f, h, j, l, m, o, q, u, v, x, y, z