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: ['7013', '8755', 'u', '9377', 'n', '6997', '507', '8557', '9745', 'g', '3019', '93', 'l', '1219', 'a', '393', '2573', 'q', 'b', '6101', 'e']
Example Output: a, b, e, g, l, n, q, u

Example Input: ['w', '6291', '3939', '9569', 'u', '1635', '3359', '8335', 'n', '2799', '7359', 'k', 'm', '2817']
Example Output: k, m, n, u, w

Example Input: ['j', '2295', '3635', 'd', '9721', '1481', 'w', '3561', 's', '111', '6121', 'g', '6005', '7669', '101', 'q', '5185', '6079', '525', '3947', '3277', '357', '3757', '5599', 't', '2095', 'm', 'n', '6905']
Example Output:
d, g, j, m, n, q, s, t, w