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.

['3411', 'a', 'v', 'j', '8925', '909', 'h', 'l', 'r', '1371', 'u', '7789', '4813', 'u', 'q', 'i', '8473', 'n', '7191', 'c', '4641', 'e', '5107', 'q', 'z', 't', '105', 'q']
a, c, e, h, i, j, l, n, q, r, t, u, v, z

['x', 'u', 'm', '8089', '9985', 'e', '2927', 'n', '7085', 'q', 'v', 'f', 'p', '5079', '3339', '7871', 'h', '7389', '733', 'e', '3387', 'b', 'x', 'z', '2039', 'u', '59', '5031', '8115', '5447', '3045', 'x', '6591', '9561', '4315']
b, e, f, h, m, n, p, q, u, v, x, z

['w', 'i', '9411', 'l', '1987', 'b', '5169', 't', 'q', 'w', 'u', '8787', '9847', '8553', 'a', '8401', '9135', '4413', '3079', 'w']

a, b, i, l, q, t, u, w