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]: ['z', 'l', 's', 'f', 'j', 'x', '1125', 'd', '37', '5009', '9187', 'b', '8683', '8841', 'y', '9955', '1571', 'm', '347', '3679', '5797', '2133', 'g', 'u', '9817', '6347', '2067', '1927', '167', '4215', '45', 't', 'd', '6599', '4751', 'g', 'l', 'u', '7881', 's']
[A]: b, d, f, g, j, l, m, s, t, u, x, y, z


[Q]: ['t', 'x', '1699', '8727']
[A]: t, x


[Q]: ['2401', 'k', 'o', '2537', 'c', 'r', 'e', 'a', '1923', '1739', '531', 'k', '8221', '2353', 'o', 'u', '6079', 'j', '351', '9133', '7115', '3805', 'c', '2367', '7693', '2509', '8035', 'o', 'q', 'f', 'w', 'z', 'i']
[A]:
a, c, e, f, i, j, k, o, q, r, u, w, z