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]: ['3411', 'a', 'v', 'j', '8925', '909', 'h', 'l', 'r', '1371', 'u', '7789', '4813', 'u', 'q', 'i', '8473', 'n', '7191', 'c', '4641', 'e', '5107', 'q', 'z', 't', '105', 'q']
[A]: a, c, e, h, i, j, l, n, q, r, t, u, v, z


[Q]: ['9425', 'l', 'c', 'n', '5925', '2543', '3935', 'c', '7533', 'j', 'q', '3775', '5897', '9435', '69', 'e']
[A]: c, e, j, l, n, q


[Q]: ['9819', 'n', 'n', '4229', '9681', '3501', '3939', '5887', '7765', '25', 't', 'a']
[A]:
a, n, t