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]: ['s', 's', '6581', 'e', '7355', '1315']
[A]: e, s


[Q]: ['7839', '849', '5651', '4275', 'e', '5453', 'h', '2099', '485', 'i', 'm', 'n', '6563', '5675', '4001', 'h', 'm', 'z', '3467', '4237', '5035', '5609', '8475', '5171', 'v', '3883', '8461', '8611', '4853', 'd']
[A]: d, e, h, i, m, n, v, z


[Q]: ['679', '455', '1887', '63', 'n', '2851', '7663', 'v', '9305', '5759', 'd', '329', '9809', 'v', '5091', 'n', '111', 'x', 'e']
[A]:
d, e, n, v, x