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]: ['r', 'j', '437', 'b', '5223', 'n', 'v', '437', 'd', '8285', 'k', 'j', 'r', 'p', 'n', 'e', 'n', 'j', 'o', '2651', 'j', '6365', 'q', 'q', '2159', 'g', '3641', '7727', 'c', '1197', 's', 't', 'n']
[A]: b, c, d, e, g, j, k, n, o, p, q, r, s, t, v


[Q]: ['5737', 'b', 'e', 't', '7419', 'n', 'y', '5225', '6485', 'b', '1343']
[A]: b, e, n, t, y


[Q]: ['103', '8381', 'o', 'k', '8799', 'b', '9571', 'q', 'd', '7873', 'j', 'q', '4363', '7389', 'n', 'j', 's', '2773', '7133', '6053', 'y', '2735', '8699', 'i', 'p', 'y', 'l', '8141']
[A]:
b, d, i, j, k, l, n, o, p, q, s, y