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.

[EX Q]: ['9483', '501', 'j', 'k', '3103']
[EX A]: j, k

[EX Q]: ['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']
[EX A]: c, d, f, h, i, k, l, m, o, p, t, v, x

[EX Q]: ['7459', '4535', '2303', 'e', 'v', '4709', 'j', '7269', 'f', 'y', 'w', 'd', '6125', 't', '1801', '5743', 'd', '2471', 'r', '9563', 'l', '9911', '3437', '5785', '561', '9599', 'x', '4705']
[EX A]:
d, e, f, j, l, r, t, v, w, x, y