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]: ['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]: ['c', '7039', 'g', '1899', 'r', '507', 'c', '2587', '3865', '1729', '3927', 'r', '3535', '2791', 'm', 'l', 'r']
[EX A]: c, g, l, m, r

[EX Q]: ['5637', 'e', 'k', '8187', '1707', '2645', '5657', 't', '3141', '3469', 'q', '6985', '3381', 'b', '9003', '1283', 'w', 'o', 'l', 'q', '8831', 'l', '5345', '1457', '4837', '5147', '2189', '683', 'i', '8909', 'g', '1689', '1703', 'd', 'o', '3275', 'l', '5197', '4435']
[EX A]:
b, d, e, g, i, k, l, o, q, t, w