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: ['7417', '2597', '2633', '7721', 'v', 'l', 'p', '4389', 'l', '3965', '6279', 'm', 'v', 'o', 'd', 'o', 'h', 'd', 'r', 'e', '8993', '2711', 'o', 'q', '1399', 'i']
Example Output: d, e, h, i, l, m, o, p, q, r, v

Example Input: ['c', 'e', '6509', '1295', 'u', '5445', '1731', '3049']
Example Output: c, e, u

Example Input: ['f', 'n']
Example Output:
f, n