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.

Input: Consider Input: ['a', '3281', '9123', '5443', 'w', 'w', 'p', '9275', 'v', 'm', '3549', 'l', 'y', 'l']

Output: a, l, m, p, v, w, y


Input: Consider Input: ['5011', 'l', '925', 'e', 'b', '3077', 'm', '4541', '781']

Output: b, e, l, m


Input: Consider Input: ['p', 'h', '5121', '5607', 'm', '755', 'n', '839', 's', 'h', 'x', 'z', 'q', '9987']


Output: h, m, n, p, q, s, x, z