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: ['e', 'n', 'y', 'f', 'l', 'h', '455', 'y', '591', 'm', '9041', 'b', 'b', 'o', '4215', '5009', 'o', 'a', '4369', 'u', '6911', '4825', 't', 'k', '6063', '2939']

A: a, b, e, f, h, k, l, m, n, o, t, u, y
****
Q: ['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']

A: b, e, f, h, m, n, p, q, u, v, x, z
****
Q: ['2969', '8987', 'p', 'v', 's', 'q', 's', 'd', 'u', 'i', 'k', 'g', 'd', '2285', 'g', 'd', '881', 'g', '2383', '9343', '4263', '6353', 'k', 'a', 'm', 'z', 'l', '335', 't', 'u', '3139', 'w', '1301', 'u', '2403', 'q', 'f', '8705', '7189', 'v', 'h', 'h', 'n', '3393', '9499']

A:
a, d, f, g, h, i, k, l, m, n, p, q, s, t, u, v, w, z
****