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', '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:
['7911', '7175', 'y', '9173', 'y', '2529', '831', 'k', '7197', 'j', '2343', 'i', 'b', '6799', '5987', '7277', 'n', 'x', 'h', '7209', 'l', 'd', 'm', 'e', '2277', '8909', 'x', '5361']

Ex Output:
b, d, e, h, i, j, k, l, m, n, x, y


Ex Input:
['t', 'd', '6709', '7761', 'z', 'l', 'z', '3051', 'q', 'x', 't', '7825', 'h', 'i', '8735', 'b', '3625']

Ex Output:

b, d, h, i, l, q, t, x, z