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', 'u', 'y', 'y', 'b', 'x', 'q', '3713', '2679']
Example Output: b, q, t, u, x, y

Example Input: ['8005', 'q', 'w', 'a', 'f', 'o', '6017', '7591', 'm', 'p', 'z', 'q', 'u', 'o', 'd', '6043', 'f', '3575', 'r', '2885', 'o', '3141', '621', '2375', 't', '5397', 'h', 'b', 'i', '3785', '1551', 'i', '8879', 'g', '5237', '7111', '2057', '1743', '9895', '2613', 'i', 'z', '677']
Example Output: a, b, d, f, g, h, i, m, o, p, q, r, t, u, w, z

Example Input: ['q', 'c', 'f', 'w', '7069', 'a', '4509', 'g', 'w', '2521', 'y', 's', 'b', '325', 'p', '5687', 'g', '6321', 'v', '7551', 'm', 'o', '3629', 'd', '9943', 'i', 'x', 'x']
Example Output:
a, b, c, d, f, g, i, m, o, p, q, s, v, w, x, y