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: ['q', '6421', 'w', 'x', '669', 'h', '3853', '6609', 'p', '947', 'g', 'c', 'x', '2617', 'v', 'e', '4795', '5755', 'a', '2379', 'y', '5939', 'l', 'h', 'g', '3779', 'c', 'm', '3157', '4027', 'g', '2917', '9461', '7271', 't', 'i', '9807', '147']
Example Output: a, c, e, g, h, i, l, m, p, q, t, v, w, x, y

Example Input: ['p', '4329', '2437', '6279', 'u', '459', 'f', 'c', 'i', 'w', 'n', 't', '429', 'n', '73', '4995', 'p', 'z', '8459', '6133', 'y', 'r', '4057', 'a', '2717', '7803', 'r', 'm', '2879', '6989', '7223', 'v', '7929']
Example Output: a, c, f, i, m, n, p, r, t, u, v, w, y, z

Example Input: ['6109', 'g', 'd', 'h', '8227', 's', 'p', 'q', '3583', 'y', 'x', 'g', '3407', 'k', '9545', 's', '1977', 's', 'l']
Example Output:
d, g, h, k, l, p, q, s, x, y