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.

['8281', '4831', '1329', 'g', 'e', '8879', 'n', 's', 'x', 'j', '6305', 'j', '921', '3677', '5107', 'n', 'j', '9285', 'a', '5329', '6671', 'c', '9283', 'l', 'a', '7907', 'q', '7605', '855', '6477']
a, c, e, g, j, l, n, q, s, x

['9351', 'v', 'h', 'z', 'g', 'f', 't', 'q', 'g', 'o', '4073', 'n', '6149', '1735', '157', 'm']
f, g, h, m, n, o, q, t, v, z

['t', '6585', 'b', '4609', '5317', 't', '2405', '9453', 't', 'o', 'f', 'o', 'z', '9023', '9701', 'z', '6655', 'x', 'h', 'a', '2301', 'p', '2937', 'v', '5961', 'p', '5093', 'y', '35', '3661', '739', '9811', '8079', '231', '7635', 'o', '4269', '4191', '9287', '2257']

a, b, f, h, o, p, t, v, x, y, z