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', 'o', '7643', '9065']
[EX A]: d, o

[EX Q]: ['7965', '6465', 'c', '7963', 'j', '6839', '9989', '1019', 'x', '1303', '2633', 'y', '6865', 'a', 'k', '635', '3719', '7229', 'k', 't', 'r', '5741', '9569', '4931', '1125', 'f', '5429', 'c', '2065', '6315', 'e', '6877', '2005', 'x', '7831', '7297', 'm', '3571', 'b', '8617', '2981', 'i', '5105', 'g', 'u']
[EX A]: a, b, c, e, f, g, i, j, k, m, r, t, u, x, y

[EX Q]: ['4795', 'm', '7197', '5765', 's', '8271', 'j', 'i', '6303', '2275', 'g', 'o', 'o', '4835', '5165', 'n', '2963', 'f', 'p', '4955', 'a', 'c', '9941', '8507', '2639', 'n']
[EX A]:
a, c, f, g, i, j, m, n, o, p, s