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]: ['2995', '8179', '8131', '5655', 'j', 'q', 'l', '3193', '1823', 'y', 'n', '7645', 's', '5665', 'r']
[A]: j, l, n, q, r, s, y


[Q]: ['7065', 'f', 'k', 'i', 'd', '8291', 'z', 'e', 'q', '5345', 'h', '3397', 's', '5355', 's', '9033', 'e', '5241', '5285', 'm', 'h', 'i', 'n', '6471', '3365', 'f', 'r', '6145', 't', '4869']
[A]: d, e, f, h, i, k, m, n, q, r, s, t, z


[Q]: ['d', 'e', 'd', 'd', 'e', 'f', '5421', '1243', 'c', '6255', '9305', '2185', '8457', '5371', '889', 'o', '6135', '7651', 'o', 'p', '3111']
[A]:
c, d, e, f, o, p