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.

[Q]: ['6143', '9073', 'h', '1459', 'q', '5799', '6555', '525', '7921', '5041', '3273', '383', 'd', '9075']
[A]: d, h, q


[Q]: ['f', '9203', 'w', 'f', '3751', '8095', '1319', 'f', '3017', 'r', 'y', '8221', '2715', '9959']
[A]: f, r, w, y


[Q]: ['k', '4793', 'h', 'i', '1541', '9035', '7557', '1205', 'r', '5183', '4797', 'l', 'x', 'a', '9783', 'z', '9737', 'c', '717', '8469', 'q', 'r', '705']
[A]:
a, c, h, i, k, l, q, r, x, z