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:
['1487', '8003', 'd', '7237', 'l', 'y', '2749', 'e', '9685', '2825', 'z', '7743', 'r', '9617', 'w', '4323', '2173', '8419', '2831', '8923', 'l', '2985', '303', 'y', '9409', 'i', 'h', 'e']

Ex Output:
d, e, h, i, l, r, w, y, z


Ex Input:
['q', 'h', 'q', '7185', 'f', 'l', 'r', '3605', 'x', 'i', 'v', '8789', 'u', 'x', 'x', '8315', 'x', 't', 'h', 'o', '4943', '5827', '7677']

Ex Output:
f, h, i, l, o, q, r, t, u, v, x


Ex Input:
['b', 'b', 'k', 'g', '8879', '2549', '4211', 'n', '3877', '689', '6107', 'v', 'i', '5467', '487']

Ex Output:

b, g, i, k, n, v