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', '6421', 'w', 'x', '669', 'h', '3853', '6609', 'p', '947', 'g', 'c', 'x', '2617', 'v', 'e', '4795', '5755', 'a', '2379', 'y', '5939', 'l', 'h', 'g', '3779', 'c', 'm', '3157', '4027', 'g', '2917', '9461', '7271', 't', 'i', '9807', '147']
a, c, e, g, h, i, l, m, p, q, t, v, w, x, y

['2349', 'p', 'a', '435', 'y', 'h', '3249', 'o']
a, h, o, p, y

['2969', 'm', '8767', 'p', '7815', '3895', 'v', '9137', '6195', 'c', '5493', '4969', 'l', '989', '1221', '6919', 'o', 'z', '3085', 'h', '8149', 'r', '1', 'l', 'a', 'r', 'i', 's', 'n', '3107', 'f', '6573', '129', '181', 'e', 'e', '5235', 'm', 't', 'l']

a, c, e, f, h, i, l, m, n, o, p, r, s, t, v, z