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:
['r', 'y', 'c', '3211', '9245', '8459', '8521', '5781', 'w', 's', 'd', '5299', 'a', 'y', 'g', 'm', '6435', '8605', 'e', 'h', '6871', 's', '387', 'l', '5829', 'e', 'd', '9545', '2945', 'k', 'v', 't', '8449', '2199', 'm', '2599', '1489', '6623', 'x', 'l']

Ex Output:
a, c, d, e, g, h, k, l, m, r, s, t, v, w, x, y


Ex Input:
['6143', '9073', 'h', '1459', 'q', '5799', '6555', '525', '7921', '5041', '3273', '383', 'd', '9075']

Ex Output:
d, h, q


Ex Input:
['7953', 'p', 'e', 'p', 'w', '1169', '9393', 'j', '9755', 'f', '6845', 'j', '3281', '5665', '3619', 'p', '2997', 'e', 'j', '5497', '3593']

Ex Output:

e, f, j, p, w