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', 'e', '6509', '1295', 'u', '5445', '1731', '3049']
[EX A]: c, e, u

[EX Q]: ['o', '8579', 'z', '3489', '8325', '8001', 'k', '1297', '1297', 'j', '8655', 'm', '7613', '7677', 'd', 'u', '123', 'n', '9605', 'p', '7627', '6489', 'x', '9989', '8701', 'd', '6505', '5607', '7909']
[EX A]:
d, j, k, m, n, o, p, u, x, z