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: ['t', 'a', '2481', '2841', 'a', '2871', 'm', '4435', 'g', '8201', '4351', '9045', 'o']

A: a, g, m, o, t
****
Q: ['q', 'h', 'q', '7185', 'f', 'l', 'r', '3605', 'x', 'i', 'v', '8789', 'u', 'x', 'x', '8315', 'x', 't', 'h', 'o', '4943', '5827', '7677']

A: f, h, i, l, o, q, r, t, u, v, x
****
Q: ['g', 'k', 'd', 's', 'b', 'c', 'c', 'v', '8597', 'n', 'z', 'a', 'j', '9205', 'q', '5111', '8429', '9481', '9991', 'o', 'b', '9629', 'y', 'b', 'r', 'r', '6479', '7605', '5019', 'i', 'l', 'l', 's', 'q', '6119', 'r', 'g', 's']

A:
a, b, c, d, g, i, j, k, l, n, o, q, r, s, v, y, z
****