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: ['u', 'd', '4193', '5687', 'p', 'r', '7787', 't']
Example Output: d, p, r, t, u

Example Input: ['c', '8389', 'j', '6113', '5843', 'f']
Example Output: c, f, j

Example Input: ['t', '6601', 'a', 'l', 'p', '6391', 'l', 'w', '9381', '6045', 'v', '1305', '1051', '8949', '2405', '4989', 'r', '3881', '5163', '4213', 'q', 'c', 'b', '1273', '2271', 's', 'p', '8451', '5859', '5389', 'r', '4043', '3303', 'k', '8729', '957', 'k', '1357']
Example Output:
a, b, c, k, l, p, q, r, s, t, v, w