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]: ['a', '3281', '9123', '5443', 'w', 'w', 'p', '9275', 'v', 'm', '3549', 'l', 'y', 'l']
[A]: a, l, m, p, v, w, y


[Q]: ['2103', '7937', 'v', '7641', '6609', '269', '4463', '4333', 'c', '8407', '4883', '6283', 'a', '8643', '3365', '1929', 'v', 'o', '2107', '7453', '9157', '5581', '5187', 'f', 'k', '8227', '6295', 'b', 'y', '4995', '1187', 'k', 'n', 'p', 'z', '8165', 'n', '7345', 'l']
[A]: a, b, c, f, k, l, n, o, p, v, y, z


[Q]: ['2987', '3587', '5481', 'z', '9113', 'j', '863', 'd', '8649', '9399', 'j', 'g', '293', 'r', '7141', 'i', '3727', 'y', '2117', 'b', 'w', 'j', '5265', 't', 'a', 'v', 'n', 'l', 'g', '8823', '3935', 'a', '6623', 'n']
[A]:
a, b, d, g, i, j, l, n, r, t, v, w, y, z