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]: ['j', 's', 'z', 'v', '5401', 'u', '8859', 'i', 'l', 'a', 'p', 'v', 'v', 'o', '3969', '4091', 'y', '6827', '1799', '5163', 'd', 'w', '4795', '5167', 'x', 'q', '2903', '1171', '5279', '449', '7901', 'u']
[EX A]: a, d, i, j, l, o, p, q, s, u, v, w, x, y, z

[EX Q]: ['v', '3765', '4065', 'a', '4201', 'f', 'x', '9275', 'q', '9303']
[EX A]: a, f, q, v, x

[EX Q]: ['q', 'r', 'd', '5025', 'd', '993', 'v', 'm', 't', 'c', '2471', '4665', '2987', 'y', 'k', 'c', 'k', 'u', 'u', 'a', '2391', 'k', 'p', 'p', '9147', 'i']
[EX A]:
a, c, d, i, k, m, p, q, r, t, u, v, y