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]: ['d', 'p', 'k', '9679', 'x', 'j', '7481', '1815', 't', 'w', '6513', 'j', '5079', '5219', 'p', '9545', 'a', '1931', '9973', '8125', '5169', '2791', 't', 'd', '2057', 'e', 'x', 'y', '7409', 'u']
[A]: a, d, e, j, k, p, t, u, w, x, y


[Q]: ['o', 'h', 'z', 'n', 'e', 'y', 't', '4371', 'm', '1059', '4853', '8529', 'l']
[A]: e, h, l, m, n, o, t, y, z


[Q]: ['2013', 'j', '8481', 'p', '3951', 'o', 'i', '6415', '1467', 'b', '3395', '4245', '5959', '9055', 'n', '8371', 'k', 's', '1573', '2291', 'r', 'z', 't', '2667', '3333', '3471', 'n', '8647', 'x', '4017', 'p', 'q', '5207', '1223', '3909', 'z']
[A]:
b, i, j, k, n, o, p, q, r, s, t, x, z