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.

['9833', '3383', 'h', '3545', '2899', 'y', 'p', 'q', '1901', '3317', '5641', 'v', 'c', 'u', '5521', 'e', '7997', '2439', '5573', '4119', 'k', '8291', '1009', '8253', '405', '233', 'p']
c, e, h, k, p, q, u, v, y

['7653', 'n', '697', '4565', 't', '7275', '2429', '1365', '7059', 'o', '8053', 'j', '2837', '957', '851', 'z', 'd', 'd', 'y', 'c', '7467', 'o', 'i', '9519', 'q', 'g', '7911', 't', 'g', '3439', '5821', '8433', 'k', 'z', 's', 'g', '685', 'i', 't', 'r', '6881']
c, d, g, i, j, k, n, o, q, r, s, t, y, z

['431', 'a', '9855', 'b', 'a', 'o', 'z', '2175', 'v', '9977', 'n', 'm', '4851', 'a', 'i', 'm', 'm', '3671', 'l', '7165', 'z', 'e', 'j', 'r', '3329', 'g', 's', 't', 'y', '8245', '6265', '7511', '3019']

a, b, e, g, i, j, l, m, n, o, r, s, t, v, y, z