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


[Q]: ['699', 'd', '6027', 'j', 'e', 'c', 't', '9983', '5471', '2649', 't', '2631', 'r', 'h', '293', 'j', '8699', 'p', 'k', '5433']
[A]: c, d, e, h, j, k, p, r, t


[Q]: ['t', 'c', 'c', '9863', '955', '9471', 'o', '4529', '3727', '4735', '9351', '2383', '5193', 'i', 'z', 'q', '6257', '701', 'd', '6645', '8137', '1799', 'a', '5789', '5659', 'n', 'o', '8049', '9523', 'p', 'x', 'q', 't', 'a', '2145', 'a', '2673']
[A]:
a, c, d, i, n, o, p, q, t, x, z