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.

['6463', '871', '5781', '283', '9653', 'f', '9661', '3365', '2889', '5499']
f

['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']
d, f, h, n, r, s, v, z

['v', '1855', '5123', 's', '989', 'p', '423', 'u', '2579', '371', '6043', 'c', '6861', 'c', 'e', '1247', '6369']

c, e, p, s, u, v