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]: ['8451', 'x', '9965', '9303', 'm', 'f', '4205', 'y', 'n', '8521', '9995', 'z', 's', '3519', 'k', 'e', 'o', 'k', '9611', 'q', 'l', 'p', '3339', '4023', 'n', 'd', '8903', 'a', 'k', 'u', '4009', 'e', 'm', '989', '4495']
[A]: a, d, e, f, k, l, m, n, o, p, q, s, u, x, y, z


[Q]: ['6143', '9073', 'h', '1459', 'q', '5799', '6555', '525', '7921', '5041', '3273', '383', 'd', '9075']
[A]: d, h, q


[Q]: ['f', 's', '3979', 'f', 'c', '3803', '4325', '6047', '473', '2311', 's', '1505', '5431', 'm', '8647', 'm', 'l', 'i', 'y', 'h', '3819', '5849', 'b', 'x', 'u', '607', 'w', 'h', '5035', 'f', 'w', 'w', 's', 'u', 'n', '5279', '2063', '4419', '5429']
[A]:
b, c, f, h, i, l, m, n, s, u, w, x, y