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]: ['k', 'r', 'f', '4369', 'z', 'z', 'l', '143', 'r', '707', '9167', 'g', '1749', 'i']
[A]: f, g, i, k, l, r, z


[Q]: ['c', 'a', 'p', 'p', '4203', '1587', '2953', '9809', '99', '5821', 't', 'i', '4213', '1809', 's', 'l', 'i', 'b', '9233', '3983', '7713', '1807', 'k', 'f', '7825', '5491', 'o', '1347', 'u', 'h', '3967', 'u', 'g', '6775', '1069', '9211', 'i', '3369', 'r']
[A]: a, b, c, f, g, h, i, k, l, o, p, r, s, t, u


[Q]: ['g', '8917', '763', 'f', '6937', '3015', 'k', 'a', 'p', 'w', 't', '6265', '5845', 'e', '737', 'l', '1089', '6243', 'o', '9463', '5937', 'l', 'm', '5207', '3631', '8189', '2035', 'r', '8887', 'd', '6707', '4395', 'y', 'z', 'd']
[A]:
a, d, e, f, g, k, l, m, o, p, r, t, w, y, z