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:
['3821', '385', 'y', '8457', '6623', 'g', '5923', 'a', '7193', 'v', 'm', '8915', 'v', '5873', 'p', 't', 'w', 'y', '3617', 'h', 'w', 'j', '8047', 'u', '2271', 'v', 'a', '2181', 's', '1051', 'b', 'a', '9967', '987', 'z', '2255', '6349', '1249', '1397', 'q']

Ex Output:
a, b, g, h, j, m, p, q, s, t, u, v, w, y, z


Ex Input:
['5345', 'f', '6605', 's', 'q', 'w', 'p', 'o', 's', 'u', 'i', '7339', '8379', 'h', '9547', 'b']

Ex Output:
b, f, h, i, o, p, q, s, u, w


Ex Input:
['v', '1553', '3821', '675', 'v', 'a', '3749', 'x', 'z', 'b', 'p', 't', 'f', '6161', '5987', 'n', '3021', '323', 'e', '9643', 'p']

Ex Output:

a, b, e, f, n, p, t, v, x, z