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: ['b', 'a', '7411', '4471', 'z', 'l', '2051', 'q', '6749', '8647', 's', 'y', 'h', '9319', 'e', '5419', 'y', 'q']
Example Output: a, b, e, h, l, q, s, y, z

Example Input: ['i', '4447', 'g', 'o', 'j', 'p', 'l', 'q', 'o', '8777', 'r', 'v', '961', '6083']
Example Output: g, i, j, l, o, p, q, r, v

Example Input: ['9951', 'i', 'e', '7255', '6361', 'p', '9913', 'd', 'q', 'q', '101', '6951', 'v', 'm', '6157', '5563', 'l', '6935', '1807', '6879', '5607', '1', '2327', 'o', '9101', '9959', 'k', '2211', '9319', '4499', '8295', 'v', 'i', 'd', 's', '7981', '7475', 'l']
Example Output:
d, e, i, k, l, m, o, p, q, s, v