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: ['747', '5385', '5313', 'p', '9581', 'r', '1339', '3919', 'e', 'e', '8057', '7739', 'i', 'e', '3311', '963', 'g', 'h', '7349', 'y', '1493', 'e', '3055']

A: e, g, h, i, p, r, y
****
Q: ['o', 'l', 'm', 't', '4487', '1019', '9903', 'c']

A: c, l, m, o, t
****
Q: ['m', '9739', 'c', 'b', '2525', 'm', '4677', '2097', 'u', 'v', 'j', '7035', 'l', 'x']

A:
b, c, j, l, m, u, v, x
****