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.

['6411', 'x', 'i', '267', 'z', 'e', '5483', '8033', '3697', 'z', '4167', 'e', 'f', '7229', 'i', 't', '2197', 'g']
e, f, g, i, t, x, z

['7187', '7081', 'j', 'i', '3725', '6333', 'h', 'f', '6639', 'r', 'n', '3559', '2785']
f, h, i, j, n, r

['9', '8879', '9329', '2679', '9271', '2117', '5867', 'd', 'v', 'z', 'b', '5601', '4077', '8873', 'z', 'x', '8987', 'j', 'k', '1537', 'w', 'o', 'm', 'p', 'd', 'd', '4109', 'f', '7741', 'y', '6629', 'c', '8809', '5671', 'c', '8917']

b, c, d, f, j, k, m, o, p, v, w, x, y, z