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]: ['a', 'w', 'm', 'g', 'c', '5475', '7391', 't', '1049', 'p', 'd', '1397', 'k', 'x', 'j', '2525', 'f', '741']
[A]: a, c, d, f, g, j, k, m, p, t, w, x


[Q]: ['4269', '1847', '2025', '601', 'g', 'n', 'h', '3499', '4977', '3579', '9355', '3489', 'm', 'm', '4401', '4605', 'l', '3977', 'h', 'd', 't', '5135', '7787', 'k', 'q', '7699', '5325', '6269', '1865', 'h', '8915', '5677', 'g', '603', '1435']
[A]: d, g, h, k, l, m, n, q, t


[Q]: ['2579', 'v', '4135', 'q', '2227', '6133', 'h', '8553', '341', '8979', '6447', '5471', '2745', 'm', '3701', 'z', 'o', 'a', '8523', '1519', '1925', '9945', '3011', '5369', '759', '7033', 'j', 'k', '3829', 'r']
[A]:
a, h, j, k, m, o, q, r, v, z