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: ['a', '533', '67', 'z', 'z', '9283', 'o', 'a', '7045', '1521', 'm', 'h', 'q', '4173', '7497', '319', '5721', '6097', 'i', '9829', '1801', '7347', 'r', 'z', '239', '4279', 'e', 'k', 'r', 'v', '6653', '599', '8597', 'd', 'r']
Example Output: a, d, e, h, i, k, m, o, q, r, v, z

Example Input: ['4045', '4739', 'd', 'e', '6789', 'e', 'q', '4909', '9511', 'h', '9543', '6725', 'a', '3683', 'q', 'k', 'd', 'q', 'z', 'b', '3245', '9877', '9155', '7751', 'e', '1015', '2379', 'f', 'y', '1121', '9801', 'c', 'h', 'l', 'f', '67', 'v', 'v', 'y', 'c', '3871', 'v', '5893', 'a']
Example Output: a, b, c, d, e, f, h, k, l, q, v, y, z

Example Input: ['2243', '485', '1287', '9295', '1233', 's', '6585', 'd', '445', '2731', '5661', '5989', '4105', 'v', 'o', 'a', '883', '9877', 'l', '7521', 'u', '7583', '8741', '3989', 'h', '8969', 'b', 'u', '7095']
Example Output:
a, b, d, h, l, o, s, u, v