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: ['s', 's', '3619', '6051', 'h', '213', '3937', 'v', 'p', 'y', '8449', '9337', '5327', 'a', 'a', 'w', '3985', 'n', 'm']
Example Output: a, h, m, n, p, s, v, w, y

Example Input: ['k', '6595', '1595', 'v', 'h', 'b', '8815', '6681', 'j', '7581', 'p', '9095', '5453', 'r', 'y', '7755', 'x', '1853', 'k', 'q', 'u', 'j', 'q', '9651', 'o']
Example Output: b, h, j, k, o, p, q, r, u, v, x, y

Example Input: ['b', '2301', '6333', '6481', 'v', 'm', '7681', '621', '8793', 'z', '8343', 'a', 'u', '3771', 'l', 't', 'u', 'x', '1425']
Example Output:
a, b, l, m, t, u, v, x, z