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]: ['3995', 'n', 'z', '8389', '7857', '3005', 'i', 'e', '1117', 'z', '8251', 'r', 't']
[A]: e, i, n, r, t, z


[Q]: ['3773', 'g', 'h', '4469', '2875', 'a', '9011', '487', '9577', 'j', '6991', '7363', '6663', 'r', '8007', '8739', 'i', 'g', '4923', 'i', '5257', '771', '3923', 'z', 'm', 'f', '8363', '6773', '8295', 'w', '8553', 't', 'z', '9597', '7011', 'l', '3477']
[A]:
a, f, g, h, i, j, l, m, r, t, w, z