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:
['5611', 'x', 't', 'p', '5711', '7079', '5251', '429', 'z', 'u', '8721', '9321', '79', 'i', '189', '3605', 'k', '445', 'r', 'k', 'o', '2189', '8521', '8849', '2651', 'm', '4149', '1577', '3085', '5275', '6413', '5265', '6089', 'r', 'f', '5013']

Ex Output:
f, i, k, m, o, p, r, t, u, x, z


Ex Input:
['7203', '8715', '3193', 'w', '7159', '8535', 'i', '2425', 'j', 'f', '6709', 'w', 'w', 's', 'e', '9337', 'r', 'r', '5255', '1707', 'u', '1443', 'e', 'e', 'v']

Ex Output:
e, f, i, j, r, s, u, v, w


Ex Input:
['9429', '5173', 'q', '4197', '8035', 'w', '175', '8613', '7743', 'q', 'l', '1421', 'g', 'r', 's', '1383', '3119', 'y', 'h', '9339', 'q', 'y', '5579', 's', 'y', '5087', '9587', '8023', '7381', '4487', 'q', 'd', 'u', 's', 't', '4909', 's', 'x', '351', '8353', '8983']

Ex Output:

d, g, h, l, q, r, s, t, u, w, x, y