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]: ['m', '6443', 'd', 'o', 'p', 'q', '3765', 'k', 'm', 'y', 'j', '3531', 'y', 't', '671', 'j', '3699', 'a', 'i', '1843', 't', 'd', '1205', 'k', 'h', '1209', '2913', '1301', 'k', 'd', '1769', '7985', 's', 'p', 'f', '4583']
[A]: a, d, f, h, i, j, k, m, o, p, q, s, t, y


[Q]: ['9013', 'e', 'm', 'p', 'k', '161', 'k']
[A]: e, k, m, p


[Q]: ['e', 's', 'l', '6939', '6091', '2627', 'a', 'z', '9647', '905', '6507', 't', '7639', '3725', 'p', '1461', 'n', 'f', '2691', '4363', '1949', 'd', '1853', '4361', '9625', 'p', '9453', '4401', '1819', '8681', '5099', '9731', '7575', '3549', '2879', 'm', 'n', 'o', '6285']
[A]:
a, d, e, f, l, m, n, o, p, s, t, z