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:
['9555', '5983', '1853', 'c', 'z', 't', 'p', '9041', 'd', '5919', '1621', '345', 's', '2647', '4261', '8611', 'w', 'x', 'p', '9103', '2599', '5101', '9261', 'k', '7437']

Ex Output:
c, d, k, p, s, t, w, x, z

Ex Input:
['5163', 'n', 'j', '67', '3801', 'n', '7113', 'z', '579', '6885', '8921', 'v', '5481', '5507', 'k', '8403', 'c', '837', 'u', '6341', 'd', 'i', '497']

Ex Output:
c, d, i, j, k, n, u, v, z

Ex Input:
['u', 'q', 'h', '3039', '8937', '4487', '8045', 'w', 'e', '8771', 'g', '9427', 'h', '4465', '1049', '6505', 'w', 'o', '1037', '8083', '1113', '8203', 'p', '2065', 'n', '775', '7157']

Ex Output:
e, g, h, n, o, p, q, u, w