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: ['7823', '2933', 'k', '4139', '5585', 'f', 'c', 'm', '2035', 'q', 'z', 'l', '1999', 'q', 'p', '7291', '2091', 'v', '423', 'e', 's', '6089', '4763', '6739']

A: c, e, f, k, l, m, p, q, s, v, z
****
Q: ['5193', 'h', 'm', '703']

A: h, m
****
Q: ['4417', '2219', 'd', '5253', 'n', 't', '1699', '545', '2167', 'm', 'g', '7995']

A:
d, g, m, n, t
****