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]: ['h', '6865', '4019', '8571', 'y', '5575', '7835', '9537', 'n', '875', 't', 'a', 's', '2769', 'p', '1607', 'n', '4087', '961', '7869', '5085', '2131', '4867', 'j', 'h', 'y', '3105', '6609', 's', 'l', '3399', '5013']
[EX A]: a, h, j, l, n, p, s, t, y

[EX Q]: ['7109', '1243', 'f', 'z', 'h', 'd', '6169', 'v', 'h', '3609', '3181', 'd', '3661', '7193', '7341', '9127', 'r', '1623', '5813', 's', 'd', '4011', '4983', 'n', '4195']
[EX A]: d, f, h, n, r, s, v, z

[EX Q]: ['8495', 'n', '5707', '8983', '2765', 'u', '2299', '7489', '4411', 'u', '3001', 'w', '9371', '9075', '4187', 'i', '403', '4677', '2739', '481', '9029', '4713', '4949', 'p', '4589', 'l', '8157', 'l', 'c', 'x', '4267', 'u', '8037', '9497', 'o', '6911', '1029', 'i', 'g', 'j', '129', 's']
[EX A]:
c, g, i, j, l, n, o, p, s, u, w, x