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:
['m', '6443', 'd', 'o', 'p', 'q', '3765', 'k', 'm', 'y', 'j', '3531', 'y', 't', '671', 'j', '3699', 'a', 'i', '1843', 't', 'd', '1205', 'k', 'h', '1209', '2913', '1301', 'k', 'd', '1769', '7985', 's', 'p', 'f', '4583']

Ex Output:
a, d, f, h, i, j, k, m, o, p, q, s, t, y


Ex Input:
['n', 'y', '7087', '9539', 'x', 'i', 'w', '7237', '8613', 'k', '5999', '4179', 'o', 'm', '7485', '1955', 'w', '1451', 'h']

Ex Output:
h, i, k, m, n, o, w, x, y


Ex Input:
['6469', '5723', 'd', 'n', '8389', 'm', 'd', 'g', '7799', '4447', '2903', 'e', '5635', 'v']

Ex Output:

d, e, g, m, n, v