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: ['v', '6635', '5395', '3263', '4391', 'h', '1521', 'f', '9861', '6125', '1673', '3679', '8681', '4967', 'f', 'a', 'c', 'k', 'n', '4155', 'e', 'm', 'i', '1699', 'r', 'f', 'u', 'r', '3451', 'v', '7239', 'o', '4359', 'l', 'a', '2925']
Example Output: a, c, e, f, h, i, k, l, m, n, o, r, u, v

Example Input: ['y', 'p', 'q', '2157', 'b', 'w', '8875', 'k', 'i', 'd', '9743', '4941', 'b', 'p', '9941', '495', 'h', 'i', '839', 'c', 'h', 'f', 'b', 'a', 'k', 'z', '7549', '4149', 'h', 'j', '1947', 't', 'f', 'c', '1243']
Example Output: a, b, c, d, f, h, i, j, k, p, q, t, w, y, z

Example Input: ['1063', 'q', 'c', '8763', '1319', '1363', 'r', '7475', '3975', 'z', 'j', 'l', 'd', '8397', 'q', '2599', 'u', '3905']
Example Output:
c, d, j, l, q, r, u, z