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.

[EX Q]: ['d', 'p', 'q', '5319', 'w', '4887', '6695', 't', '7711', 'l', '7597', 's', 'n', '1461', 'e', '9045', '1307', 'j']
[EX A]: d, e, j, l, n, p, q, s, t, w

[EX Q]: ['w', '9437', 's', '9819', 'q', 'q', '4443', 'p', '377', '6777', 's', 'x', 'a', 'o', '9205', '9289', '7103', 'k', 'l', '9453', '9043', 'k', 'r', 'g']
[EX A]: a, g, k, l, o, p, q, r, s, w, x

[EX Q]: ['2599', '5229', '6093', '3407', '5251', '4457', '6363', 'l', '8777', '3', 'k', '887', 'f', '1619', 'z', '2535', '625', '2753', '2353', '3639', '8859', 'k', '1247', 'j', 'n', 'e', 'n', '4659', '5091', 'r', 'j', 't', 'c', '3301', '4405', 'r', 'a', 'v', '1815', '2141', '8487', 'b', 'w', '5829']
[EX A]:
a, b, c, e, f, j, k, l, n, r, t, v, w, z