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:
['y', 'p', 'q', '2157', 'b', 'w', '8875', 'k', 'i', 'd', '9743', '4941', 'b', 'p', '9941', '495', 'h', 'i', '839', 'c', 'h', 'f', 'b', 'a', 'k', 'z', '7549', '4149', 'h', 'j', '1947', 't', 'f', 'c', '1243']

Ex Output:
a, b, c, d, f, h, i, j, k, p, q, t, w, y, z


Ex Input:
['2409', 'q', 'w', 'e', 'x', '4737', 'w']

Ex Output:
e, q, w, x


Ex Input:
['h', 'o', '7417', '9401', '5189', 'o', 'm', '6027', 'i', 'z', 'n', 'q', 'r', 'j', '7747', 'u', '6433', 's', '7285', '3439', '6733', '1633', 'f', 's', 'a', '7239', '8373', 'z', '8791', '3021', '1905', '2349', 'h', '95', '1207', '9135', 'g', '345', 'b', '1489']

Ex Output:

a, b, f, g, h, i, j, m, n, o, q, r, s, u, z