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:
['c', 'h', '8655', 'r', '7531', 's', 'r', 'w', 'e', 's', 'p', '1709', '5447', 'b', '5855', 'w', 'f', 'i', '7809', 'q', '1975', 'z', '4037', 'k', 'l', 'z', 'g', '9739', '8801', '3405', '6549', '4561', 'd', '1669']

Ex Output:
b, c, d, e, f, g, h, i, k, l, p, q, r, s, w, z


Ex Input:
['7109', '1243', 'f', 'z', 'h', 'd', '6169', 'v', 'h', '3609', '3181', 'd', '3661', '7193', '7341', '9127', 'r', '1623', '5813', 's', 'd', '4011', '4983', 'n', '4195']

Ex Output:
d, f, h, n, r, s, v, z


Ex Input:
['m', '9525', '2965', '7719', 'i', 'b', 'r', 'e', '9309', 't', 'z', '5703', '6543', '5079', '7407', 'k', '1431', 'w', 'q', '1101', 'w', '7617', 'k', 'z', 'l', 'v', '2693', 'z', '4861', '1993', 'c', '3647', 'p', 'k', 'v', '3703', 'n', '929', '743']

Ex Output:

b, c, e, i, k, l, m, n, p, q, r, t, v, w, z