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:
['9579', 'm', 'v', 'r']

Ex Output:
m, r, v


Ex Input:
['3773', 'y', '811', 'l', '3163', '4289', 'c', '6627', '2745', '2283']

Ex Output:

c, l, y