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:
['1345', 'y', '7221', 'h', 'r', '3255', 'k', 'r', 'j', '8639', '467', 'f', 'k', 'n', 'k', 'j', 'l', 'w', '143', 'w', 'q', '5657', '589']

Ex Output:
f, h, j, k, l, n, q, r, w, y


Ex Input:
['7013', '8755', 'u', '9377', 'n', '6997', '507', '8557', '9745', 'g', '3019', '93', 'l', '1219', 'a', '393', '2573', 'q', 'b', '6101', 'e']

Ex Output:
a, b, e, g, l, n, q, u


Ex Input:
['u', 'a', 'q', '6415', '2757', 'd', '1171', '4439', 'b', '9927', 'h', '1107', 'y', 'b', '9593', '3611', 'a', '1271', '3925', 'm', 'q', '8289', '8945', '6673', '7711', 'w', 'l', '6725', 'p']

Ex Output:

a, b, d, h, l, m, p, q, u, w, y