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.

['1487', '8003', 'd', '7237', 'l', 'y', '2749', 'e', '9685', '2825', 'z', '7743', 'r', '9617', 'w', '4323', '2173', '8419', '2831', '8923', 'l', '2985', '303', 'y', '9409', 'i', 'h', 'e']
d, e, h, i, l, r, w, y, z

['1345', 'y', '7221', 'h', 'r', '3255', 'k', 'r', 'j', '8639', '467', 'f', 'k', 'n', 'k', 'j', 'l', 'w', '143', 'w', 'q', '5657', '589']
f, h, j, k, l, n, q, r, w, y

['v', '8973', '7215', 'a', 'l', '4701', '3745', '7541', '4937', 'h', 'v', 'z', 'b', 'y', '4639', '3087', 'o', '8809', '5723', 'd', '1685', '3785', '9635', 's', '161', '2733', '925', '5711', '8147', '1163', 'b', '2235', 'l', 'c', 'a', 'w', 'g', 'u', 'd', 'x', '3755']

a, b, c, d, g, h, l, o, s, u, v, w, x, y, z