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: ['l', 'u', '3901', '341', '5801']

A: l, u
****
Q: ['u', '8229', '2731', '6595', '4675', 'n', 'a', '7361', '7401', '7273', 'b', '279', '5539', '7919', 'j', 'x', '9521', '8837', '7391', 'h', 'x', 'h', '7283', 't', '3769', '2317', '9131', 'h', 'y', 'c', '1625', 'm', 'e', 'a', '8437', '7543', 'p', '2451', 'k', 'r']

A: a, b, c, e, h, j, k, m, n, p, r, t, u, x, y
****
Q: ['g', '3745', 't', '2461', 'p', 'x', 'f', '5559', '5673', 'b', 'o', '6791', 'h', 'i', 's', 'y', 'v', '3985', 'e', '6073', '9873', 'm', '9253', 'o', 'i', '2537', 'k', '7503', 'k', 'g']

A:
b, e, f, g, h, i, k, m, o, p, s, t, v, x, y
****