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.

Q: ['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']

A: c, d, e, f, h, j, l, m, o, q, u, x, z
****
Q: ['6411', 'x', 'i', '267', 'z', 'e', '5483', '8033', '3697', 'z', '4167', 'e', 'f', '7229', 'i', 't', '2197', 'g']

A: e, f, g, i, t, x, z
****
Q: ['941', 'h', '3385', 'v', 'x', '9275', 'x', '6883', 'e', '6659', '4437', 'p', '1511', '5193', '1653', 's', '9861', '8321', '4387', '9331', '933', 's', 'i', '3707', '1915', 'c', 'j']

A:
c, e, h, i, j, p, s, v, x
****