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: ['8051', 'h', 'g', 's', 't', 'p', 'w', 'x', 's', '8521', 'm', '9719', 'j', 'n', 'i']

A: g, h, i, j, m, n, p, s, t, w, x
****
Q: ['9627', '9879', '5421', '4755', '1533', '6727', 't', '7641', 'd', '3929', 'h', '3989', '8441', 'k', 'p', '2653', 'm', 'b', 'i', '3431', '4907', '5687', 'g', 'h', '9185', '5051', 'k', '7135', '709']

A: b, d, g, h, i, k, m, p, t
****
Q: ['o', '9663', '5365', 'a', '9345', '389', 'p', 'q', '7901', 'g', 'c', '9663', '5083', '9649', 'e', 'z', 'g', 'f', '6659', '3701', '6605', 'e', '2995', 'p', 's', 'l', '5483', 'm', 'e', '9677', 'w', '7775', 'm', '851', '8681', 'o', 'h', '3267']

A:
a, c, e, f, g, h, l, m, o, p, q, s, w, z
****