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: ['7155', 'y', '145', '7147', 'u', '8453', 'd', '3693', '6471', '5289', 'n', 'p', '8289', '2929', '199', 'e', '8377', '8937', '5315', 't', 'l', '7715', 'c', 'y', 'f', '9999', 'p', '3655', '5489', 'q', '2321', '9881', '2265', 'n', 'v', '455']
Example Output: c, d, e, f, l, n, p, q, t, u, v, y

Example Input: ['d', '771', '4193', 'e', '1537', 'a', 'q']
Example Output: a, d, e, q

Example Input: ['9685', '4041', 'e', '9993', 'p', '949', '6683', 'y', '8011', 'v', 'b', '4903']
Example Output:
b, e, p, v, y