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.

Ex Input:
['u', 'w', '401', 't', 'g', 'h', 'g', '8073', '9597', '1347', '7835', '5007', '977', 'p', '7679', 'b', '4883', '4931', '999', 'r', '1181', 'x', '2063', 'l', 'w', 'i', 'l', 'x', 'i', '9057', '5007', 'w', '743', '1635', 'y', 'f', '9227', 'z', '5227', 'd', '7129', 'k', '7657']

Ex Output:
b, d, f, g, h, i, k, l, p, r, t, u, w, x, y, z

Ex Input:
['z', '8407', 'y', 'h', '1377', '3511', '1449', 'z', '3991', 'n', 'x', 't', 'h', '6389', '8049', '6091', '7787', 'p', 'l', '5815', 'k', 'e', 's', 'a', '9491', 'w', '1909', '4801', '4725', 'i']

Ex Output:
a, e, h, i, k, l, n, p, s, t, w, x, y, z

Ex Input:
['5059', '8639', 'c', '209', 'u', '6157', '8219', 'a', 'f', '1371', '6517', '5907', 'n', 'o', '4375', 'q', '2515', '4367', 'n', '5939', 'x', 'k', 's', '929', '9073', '4903', 'd', 'z', 'g', 'z', 'u', '6075', 'y', 'u', 'd', 'i', '9777', '3419', 'h', 'v', 'q', '39']

Ex Output:
a, c, d, f, g, h, i, k, n, o, q, s, u, v, x, y, z