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: ['k', '1995', 'b', '2581', 'x', '2639', 'i', '6761', '2701', 'd', '6993', '9375', 'r', 'm', '249', '8115', '8179', 't', '4901', 'i', '6197', '2809', 'e', 's', 'j', '4261', 'f', '6649', '7527', '3839', '5651', '9287', 'n', '2505', 's', 'q', '2825', 'g']
Example Output: b, d, e, f, g, i, j, k, m, n, q, r, s, t, x

Example Input: ['8821', '9833', 'l']
Example Output: l

Example Input: ['4075', '4773', '9713', '8407', 'w', 'x', '3773', '1189', '8753', 'd', '7623', 't', 'q', '13', 'n', 'g', '7963', '2757', '2927', 'y', '7405', 'q', 'a', '9525', '69', 'n', 'p', 'j', '5933', 'v', '9285', '5615', '6329', 'j', 'b', '309', 'g']
Example Output:
a, b, d, g, j, n, p, q, t, v, w, x, y