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]: ['m', '3809', 'l', 'k', '1929', '7963', 'n', 'u', '2125', 'g', 'o', '8325', 'o', 'h', 'y', '3025', 'e', 'e', 'c', 'x', '8445', '4979', 'z', 'f', '4201', '4765', 'g']
[A]: c, e, f, g, h, k, l, m, n, o, u, x, y, z


[Q]: ['749', 'r', 'a', 's', 't', '5905', 'm', 'd', '8437', '4583']
[A]: a, d, m, r, s, t


[Q]: ['1663', '6923', '6495', '1107', '3755', '9733', '7285', 'm', 'p', 'a', 'k', 'y', '5443', 'i']
[A]:
a, i, k, m, p, y