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:
['1593', '8165', 'q', '6689', 'b', 'r', '373', 'g', '6505', '415', '495', 'j', 'j', 'f']

Ex Output:
b, f, g, j, q, r


Ex Input:
['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 Output:
d, f, h, n, r, s, v, z


Ex Input:
['m', '351', '7989', 'x', 'x', 'e', '7635', '3243', 'y', '8303', 'r', '633', '9853', '7049', 'x', 'l', '2793', 'j', 'p', '3965', '4577', 'i', 't', 'i', '721', '2797', 'r', '2607', '7765', 'l', '5641', '3781', '1751']

Ex Output:

e, i, j, l, m, p, r, t, x, y