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

['8887', '1199', 'r', '7209', 'k', '7567', '7239', 'k', '5123', 'w', '4523', 't', 'd', '5289', '5737', '485', 'w', 't', '7651', 'v', '7213', '7687', 'y', 'w', '7265', 'b', 'b', '3667', 'z', '9935', 'i', 'l', 'u', '6715', 'j', '9815', '8925', '7941', 'w', 'm', '3907', '621', '5523', '5849']
b, d, i, j, k, l, m, r, t, u, v, w, y, z

['7719', 'k', 'q', 't', '691', '6675', 'i', 'd', 'c', 'n', '3017', '9759', 'e', 'm', 'c', '7307', 'g', 'y', '6755', '2871', '4041', '5447', 'l', 'h', 'm', 'g', 't', 'f', '4525', 'a', '4703', 's', 'p', '6169', 'y', 'j', '4221', '3213', 'q', 'r', '8593', '9295']

a, c, d, e, f, g, h, i, j, k, l, m, n, p, q, r, s, t, y