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:
['5859', 'x', 'z', 'v', 'l', 'z', 'g', 't', 'x', '341', '7023', '4937', 'b', 'n', 'y', 't', 's', '1369', '4461', 'f', '1315', 'l', '5221', '6583', 'h', 'j', 't']

Ex Output:
b, f, g, h, j, l, n, s, t, v, x, y, z


Ex Input:
['q', 'c', 'o', 'e', 'n', 'q', 'w', '9475', 'w', '863', 'r', '2219', '3483', '5035', '8209', '7957', 'b', '3735', '1423', 'l', '3409', '7639', 'd']

Ex Output:
b, c, d, e, l, n, o, q, r, w


Ex Input:
['x', '5629', 'k', 't', '5963', 'b', '5067', '2551', 'h', '3997', 'y', '9195', 't', '537', 'c', '1363', 'g', '5605', 'l', 'y', '5513', '7883', '453', 'v', '951', 'g', 'e', 'b', 'd', '1979']

Ex Output:

b, c, d, e, g, h, k, l, t, v, x, y