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:
['5345', 'f', '6605', 's', 'q', 'w', 'p', 'o', 's', 'u', 'i', '7339', '8379', 'h', '9547', 'b']

Ex Output:
b, f, h, i, o, p, q, s, u, w


Ex Input:
['n', 'h', 'h', 'e', 'p', '1265', '4853', '9433', '1227', '1619', '6381', 'o', '8285', 'k', 'u', '7471', 'm', '6887', '6579', '5813', '5563', '8535', 'n', '3743', 'h', 't', '4497', '2791', 'e', 'v', '6769', '7969', 'x', 't', 'x', 'q']

Ex Output:
e, h, k, m, n, o, p, q, t, u, v, x


Ex Input:
['i', 'g', '9531', 'w', 'u', 'f', '9789', 'd', '9407', '9847', '2111', 'q', 'b']

Ex Output:

b, d, f, g, i, q, u, w