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.

Input: Consider Input: ['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']

Output: b, d, i, j, k, l, m, r, t, u, v, w, y, z


Input: Consider Input: ['8005', 'q', 'w', 'a', 'f', 'o', '6017', '7591', 'm', 'p', 'z', 'q', 'u', 'o', 'd', '6043', 'f', '3575', 'r', '2885', 'o', '3141', '621', '2375', 't', '5397', 'h', 'b', 'i', '3785', '1551', 'i', '8879', 'g', '5237', '7111', '2057', '1743', '9895', '2613', 'i', 'z', '677']

Output: a, b, d, f, g, h, i, m, o, p, q, r, t, u, w, z


Input: Consider Input: ['g', 'n', 'n', '9515', '165', 'e', '7539', 'v', '9145', 'i', 'k', '3239', 'k', 'n', 'c', '5295', 's', '993', '9225', 'v', 'l', '2571', 'c', '3613', 's', '9927', 'd', 'n', '9581', '5009', '1349', '7407', 't', 's', 'w', '9463', '9053', 'p', '2555', '9251', 'r', 'a', '6567', '5183']


Output: a, c, d, e, g, i, k, l, n, p, r, s, t, v, w