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: ['z', 'm', 'n', 'u', '9159', '7931', '5401', '1383', '8195', 't', 'x', 'q', 'r', '2535', 's', 'j', 'c', '8123', '2429', '5581', 'k', 'c', 't', 'i', 'm', 'o', 't', 'q', '4819', 't', '1649', 'r', 'y', 'z', '8813', '7451', '199', 'o', 'x', 's', 's', '6747']
Example Output: c, i, j, k, m, n, o, q, r, s, t, u, x, y, z

Example Input: ['2103', '7937', 'v', '7641', '6609', '269', '4463', '4333', 'c', '8407', '4883', '6283', 'a', '8643', '3365', '1929', 'v', 'o', '2107', '7453', '9157', '5581', '5187', 'f', 'k', '8227', '6295', 'b', 'y', '4995', '1187', 'k', 'n', 'p', 'z', '8165', 'n', '7345', 'l']
Example Output: a, b, c, f, k, l, n, o, p, v, y, z

Example Input: ['7903', '1483', 'c', 'i', 'n', 'h', '7723', '8503', 'n', '8509', 'd', 'o', 'y', '8775', '6691', 'x', '105', 'm', '8289', 'q', '1095', 'k', '761', '8385', 'h', 'y', 'y', '1639', '397']
Example Output:
c, d, h, i, k, m, n, o, q, x, y