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: ['p', 'k', 'i', '753', 'u', 'm', '3817', '1597', 'l', 'm', 'a', 'i', 'b', 's', 'c', '2561', 'x', '5363', '1173', '8657', '2033', 'b', 'p', '3093', 'k', '6535', '307', '9925', 'b', 'q', 'q']
Example Output: a, b, c, i, k, l, m, p, q, s, u, x

Example Input: ['p', 'v', '1099', 'y', '1313', 's', '181', 'u', 'e', 'u', '8435', '4125', '8661', 'c', '4605', 'f', 'x']
Example Output: c, e, f, p, s, u, v, x, y

Example Input: ['p', 'a', 'g', 'r', 'i', '6545', '133', 'i', '7125', '9049', 'd', 'u', 'a', '2209', 'x', 'h', '5289']
Example Output:
a, d, g, h, i, p, r, u, x