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.

['y', 'p', 'q', '2157', 'b', 'w', '8875', 'k', 'i', 'd', '9743', '4941', 'b', 'p', '9941', '495', 'h', 'i', '839', 'c', 'h', 'f', 'b', 'a', 'k', 'z', '7549', '4149', 'h', 'j', '1947', 't', 'f', 'c', '1243']
a, b, c, d, f, h, i, j, k, p, q, t, w, y, z

['3117', 'i', 'd', '7537', 'i', 'q', '4649', '7263', '3655', 'd', 'x', '8569', 'g', '2389', '3933', '7099', '563', '3055', '9941', 'm', 'c', '3529', '3577', 'x', 's', 's', '6153', '1731', '9679', 'f', '8839', '5183', '5', '6433']
c, d, f, g, i, m, q, s, x

['n', '1407', 'y', '8013', '4897', 'a', '8517', '2777', '109', '3325', 'o', 'p', 'r', '9647', '4267', 'w', '6145', 'u', '7855', '5051', '1445', 'h', 's', 's', 'i', 'z', 'o', '935', 'u', '8793', '2597', '3575', '4549', 'y']

a, h, i, n, o, p, r, s, u, w, y, z