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:
['l', '7111', 'd', 'e', 'h', 'z', 'x', '5673', 'v', '8255', 'i', 'z', 'c', 'i', '4287', 'q', '9293', '9137', 'p', 'n', 'o', 'n', '7883', '6453', '7355', '8769', 'y', '9153']

Ex Output:
c, d, e, h, i, l, n, o, p, q, v, x, y, z


Ex Input:
['c', '9125', '6049', '5201', 'v', '9311', 'q', '3305', 'l', 'q', '3387', '3647', 'x', '471', 'a', '5631', 't', '9679', '5423', '2569', 'w', 't', '6397', 'e', 'h', 'c', 'v', 'v']

Ex Output:
a, c, e, h, l, q, t, v, w, x


Ex Input:
['i', '69', '4193', '6489', 'n', '5101', 'n', '8623', '5605', '4285', '5735', 'n', '1903', '9541', '1131', '2233', '8267', '731', 'p', 'g', '1925', '8423', 'n', '4997', 'p', 'o', '2001', '8987', 'a', '4927', '3155', 'x', '873', '7481', '3829', '8411', 'h', 'l', 'l']

Ex Output:

a, g, h, i, l, n, o, p, x