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: ['4423', '8295', 'h', '4881', 'j', 'c', '1185', 'z', 'm', '2725', 'p', '9187', '6275', '1617', '2523', '9879', '4149', '2197', '3909', '5155', '691', 'r', 'e', 'u', 'l', 'd', '1581', '2763', 'c']

A: c, d, e, h, j, l, m, p, r, u, z
****
Q: ['8489', 'h']

A: h
****
Q: ['t', 'c', 'j', 'p', 'w', '6503', 'q', '617', '6899', 'i', '4759', 'd', '3003', '5103', 'v', '3389', 'p', '7677']

A:
c, d, i, j, p, q, t, v, w
****