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:
['z', 'h', '2065', '6773', 'v', '151', '8957', 't', 'l', 'j', '7867', 'v', '799', '9009', '4317', 'm', '6921', 'r', '1245', '5637', 'x', '4465', 'f', 'y', '3549', 'e', 'f', 'm', 't', '6281', '4241', '3415', 'z', 'g']

Ex Output:
e, f, g, h, j, l, m, r, t, v, x, y, z


Ex Input:
['3627', '2051', '3203', 'c', 'r', 'a', '1453', 'e', 'z', 't', '1093', '4651', 'a', 'f', '8159', '9623', 'l', 't', 'r', '6963', '7071', '8103', '3493', 'y', '2369', '609', '2011', 'f', '187', 'f', 'c']

Ex Output:
a, c, e, f, l, r, t, y, z


Ex Input:
['8483', '8453', '813', '2107', '7659', 'x', '8663', 'q', '9403', '5267', 'j', 'k', '7749', 'l', 'm', '9847', '6451', '6669', 'c', 'b', 'y', 'r', 'n', '8965', 'e']

Ex Output:

b, c, e, j, k, l, m, n, q, r, x, y