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:
['o', '1217', '449', 'n', 'e', 'o', 't', '9043', '1925', '5687', '7197', '7943', 'u', '5053', 'q', 'e', '89', 'l', 'h', '3083', '4295', 'o', 'n', '6309', '743', 'n', 'j', '2105', 's', '6845', 'p', 'p', '1355', '3757', 'v', 'f', '961', '4623', '4633', 'p', '4593', 'p', '7337', 'o', 'u']

Ex Output:
e, f, h, j, l, n, o, p, q, s, t, u, v


Ex Input:
['i', '1129', 'f']

Ex Output:
f, i


Ex Input:
['s', 'u', 'a', 'g', 'a', '4601', 'n', 'p', '3241']

Ex Output:

a, g, n, p, s, u