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: ['9947', '3353', '8643', '4621', '4857', 'y', '7075', 'c', '8911']

A: c, y
****
Q: ['3191', '2655', '239', '2585', '3369', '7815', '5919', '8269', '5633', 'x', '8085', '2909', 'y', '2465', 'i', '1579', 'u', '2371', 'l', '1949', '51', 'e']

A: e, i, l, u, x, y
****
Q: ['9805', 'h', '8521', 'i', '9731', 'y', '6403', '3971', '4725', 'i', '6809', '8393', 'q', 'j', '3305', 'y', 'f', 'y', 'u', '9003', 'p', '4455', '1709', 's', '7963', 'o', 'j', '9133', 'l', '1613', '1163', '2859']

A:
f, h, i, j, l, o, p, q, s, u, y
****