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:
['7441', '7967', '2011', '1383', 'i', '3623', 'b', 'y', 'e', '1593', 'r', 'a', 'd', 'b', '6159', '3931', '989', '435', 'o', 'y', 'j', 'w', '7669', 'y', '5781', 'u', '531', '7467', '3971', '8139', 'w', 'a', '5113', '9461', '8377', '7431', '6975', '6055', '7307', 'v']

Ex Output:
a, b, d, e, i, j, o, r, u, v, w, y


Ex Input:
['c', '6027', 'o', 'h', 'l', '7893', 'u', 'f', '7661', '4715', '1373', '4799', 'd', 'z', '411', '4753', 'd', '8241', '1589', '4173', '3921', 'j', 'o', '5067', '8879', 'e', 'm', '9543', '9625', '855', 'u', 'd', '5859', '4243', '5747', '5147', '7315', 'd', 'x', 'q', '7841', '7397', 'm']

Ex Output:
c, d, e, f, h, j, l, m, o, q, u, x, z


Ex Input:
['v', 'b', 's', 'f', '401', 'h', 'o', 'c', 'f', '9297', '7891', '4701', 'p', '3605', '9295', 'a', '7435', 's', '1091', 'f', 'x', '9697', 'd', '91', '7621', 'b', 'd', '8951', '5387', 'm', '8455', '5789', 'z', '6517', 'y', 'n', 'v', 'b', 'n', '9273', '8439', 'f', 'u', 'a']

Ex Output:

a, b, c, d, f, h, m, n, o, p, s, u, v, x, y, z