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

Example Input: ['6585', 'i', 'p', '5623', '3557', '8011', 'c', '6389', 'h', 'h', 'd', '1823', '5567', 'v', 'p', 'x', 'c', '2161', '3649', 'o', '6227', 'f', '9975', 'd', 'm', '2587', 'o', 't', 'k', '7637', 'm', 'l']
Example Output: c, d, f, h, i, k, l, m, o, p, t, v, x

Example Input: ['7197', '5719', 'm', '3647', 'v', 'o', '7869', 'p', '5031', '8783', 'u', '6559', '2681', '635', '5941', '581', '1211', 'j', 'q', 'm', 'e', 'l', '8941', '6729', '6045', 'f', '7981', 'm', '4011', '2669', 'v', '5603', '3355', '5239', 'm', 'f']
Example Output:
e, f, j, l, m, o, p, q, u, v