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]: ['x', '4283', 'n', 'b', 'g', 'p', '8305', '7781', '5907', 's', '1305', 'w', '8623', 'o', 'c', 'u', '1839', '2869', '7537', 'y', '2395', '5309', 'e', '4059', 'l', '6647', 'p', '9717', 'y', 'y', '3769', '2527', '2981', '5255', '4063', 'j', '4843', 'j', '9355', 'z']
[A]: b, c, e, g, j, l, n, o, p, s, u, w, x, y, z


[Q]: ['y', 'i', '257', '3695', 's', '6717', '4817', '4117']
[A]: i, s, y


[Q]: ['5811', 'p', '8609', 'h', 'w', '3919', 'l', 'l', 'f', '6053', 'l', 'e', 'r', '1087', 'z', 'j', '4953', '3523', 'q', '3977', '9673', 'w', '5427', 'm', '3117', 'x', '4355', '1653', '9583', '9027', '8429', 'n', '2185', '3465', 't']
[A]:
e, f, h, j, l, m, n, p, q, r, t, w, x, z