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 Input:
['2293', 'p', '9787', '7241', '8689', 'u', '3141', 'h', 'c', 'b', 'f', 's', '319', 'c', 'p', '6909', 'p', 'f', '1717', 'd', '2285', 's']

Ex Output:
b, c, d, f, h, p, s, u


Ex Input:
['q', 'h', 'q', '7185', 'f', 'l', 'r', '3605', 'x', 'i', 'v', '8789', 'u', 'x', 'x', '8315', 'x', 't', 'h', 'o', '4943', '5827', '7677']

Ex Output:
f, h, i, l, o, q, r, t, u, v, x


Ex Input:
['8895', 't', 'p', '5793', 'u', '8417', '1061', '8681', '9917', 'l', 'o', '3415', 't', '6897', 'l', 'g', 'r', '2057']

Ex Output:

g, l, o, p, r, t, u