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: ['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: ['6249', '1235']
Example Output: -1

Example Input: ['4285', '4177', 'u', '8439', '7737', '1575', '8687', '9741', 't', '1077', 'w', '8961', 'm', '3141', '7041', 'a', 'm', 'i', 'n', 'f', 'o', 'w', 'y', 's', '2929']
Example Output:
a, f, i, m, n, o, s, t, u, w, y