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: ['t', 'm', '7071', 'j', '353', 'n', 'a', 'm', '9211', 'i', '9537', 'q', '7669', '869', '8753', '8071', '375', '9971', 'c', 'n', '5851', 'u', '2491', '2697', '2789', '4683', '879', 'q', 'g', 'p', 'd', 'x', 'r', 'i', '8171', '5449', '2477', '1151', 'z', '3845', '1079', 'j', 'n', 'p', '8199']
Example Output: a, c, d, g, i, j, m, n, p, q, r, t, u, x, z

Example Input: ['6599', 'f', 'c', '661', 'q', 'e', '1951', 'f', 'f', 'a', 'd', '9521', '853', 'n', 'w', '6451', '5549', 'k', 't', 'l', 'z', 'm', 'k', '567']
Example Output: a, c, d, e, f, k, l, m, n, q, t, w, z

Example Input: ['4429', 'm', 'p', '3405', '7093', '9797', '7153', '9595', 'a', '7869', '6511', '1759', '9347', 'm', 'g', 'k', 'j', 'w', '1467', 't', '8367', '4421', 'x', 'v', 'g', 't', 'k', 'i', 'e', 's', '4083', '2069', '5097', 's', '6127', '265', 'g', 'g', '9645']
Example Output:
a, e, g, i, j, k, m, p, s, t, v, w, x