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:
['5293', '2211', 'r', 'j', 'x', 'y', 'u', 'n', 'r', 'l', 'v', '113', 'v', 'e', '1323', '6291', 'a', '7417', 'j', '4175', 'd', '855', 'z', '1123']

Ex Output:
a, d, e, j, l, n, r, u, v, x, y, 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:
['l', '4639', '1721', '9259', 'n', '2021', 'm', '1655', 'y', 'g', 'o', 'q', 'n', '7281', 'b', '6549', '2953', 'c']

Ex Output:

b, c, g, l, m, n, o, q, y