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]: ['n', '9571', '2983', '7597', 'v', 'y', '1993', '1403', '8309', '7043', 'c', '7329', 'p', '4479', 'p']
[A]: c, n, p, v, y


[Q]: ['l', 'o', 's', '7411', '7847', '2557', '1977', '2863', '2325', '4177', '4183', '4241', '1005', '1137', '1371', 'v', 'p', 'a', '2453', 'l', '6315', 'l', '6463', 'n', '7645', '9669', '5411', '1631', '5995', 'z', '227']
[A]: a, l, n, o, p, s, v, z


[Q]: ['7071', '75', 'h', 'h', 'o', 'c', '4857', '9643', 'j', '3443', '41', '4845', '4845', '4935', '8947', 'p', 'i', '3493', '711', '5499', '7733', 's', 'd', '1753', '2639', '2963', 'z', '123', 'l', '3537', 't', 's', '6799', 'n', '2797', 'u', 'e', '9385', '9939', '8357', 't', 'f', 'g', 'r']
[A]:
c, d, e, f, g, h, i, j, l, n, o, p, r, s, t, u, z