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]: ['r', 'n', '7583', '8697', '7927', 'l', '5003', '1363', 'p', 'e', 'q', '6227', '6915', '8619', '9011', 'n', '3063', '3799']
[A]: e, l, n, p, q, r


[Q]: ['9351', 'v', 'h', 'z', 'g', 'f', 't', 'q', 'g', 'o', '4073', 'n', '6149', '1735', '157', 'm']
[A]: f, g, h, m, n, o, q, t, v, z


[Q]: ['3557', '7505', '7355', '769', 'h', 'i', '3357', 'x', '9737', '7', 'n', 'x', 'v', 'h', 'h', 'd', '2713', '1557', '9621', 'v', 'z', '6663', 'd', 'p', '4481', '6683']
[A]:
d, h, i, n, p, v, x, z