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.

['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

['g', 'h', 'g', 'g', 's', 'h', '2849', '2705', '1185', 'x', '5789', '8221', 'e', 'x', 'g', 'b', '4903', 'q', '1563', 'r', 'k', 't', '9047', 'p', 'p', '9397', 'u', '7473', 'f', 'o', 'y', '1957', '1039', '9905', 'i', '4829', 'q', 'w', 'k', 'p', 't', '563', 'g', 'l']
b, e, f, g, h, i, k, l, o, p, q, r, s, t, u, w, x, y

['o', 'i', 'a', '6473', 'b', 'v', '4065', 'u', '6129', 'h', '353', '1519', '2935', 'h', 'g', 's', 'u', '4915', '4303', 'g', 't', '7969', '6041', 'w', '5031', '969', '8155']

a, b, g, h, i, o, s, t, u, v, w