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: ['1449', 'a', '6261', '303', '4651', 'n', 'u', '1595']
Example Output: a, n, u

Example Input: ['2047', '4403', 'g', '3017', '1627', 'v', 'r', '2237', '5513', 'o', 'v', '7229', '9801', 'j', '443', 'z', 'q', 'y', '7447', '1659', '3411', '55', '5153', '9921', '2195', '1075', '8187', 'p', 'x', 'h', 'y', 't', 'a', 'r', 'f']
Example Output: a, f, g, h, j, o, p, q, r, t, v, x, y, z

Example Input: ['1653', '4461', '1505', 'e', '377', 'v', '3443', '55', '3507', 'y', '3391', '8643', 'm', '2881', '3037', 'q', 'a', 'p', 'f', '9043', 'w', '9999']
Example Output:
a, e, f, m, p, q, v, w, y