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', 'g', 'd', 'p', '8163', '6643', 'o', 'p', 'm']

Ex Output:
d, g, l, m, o, p


Ex Input:
['5089', '6113', 'v', 'l', '5529', 'q', '7499', 'e', 'r', 'c', '5999', '2619', 'a', '2523', '7697', 'j', 'c', '6537', '8313', '5623', '4225', '7677', 'q', 'a', '6559', 'y', 'b', 'm', '7645', '7019', 'r', 'i', '5225', '703', 'i', '6189', 'f', 't', '7553']

Ex Output:
a, b, c, e, f, i, j, l, m, q, r, t, v, y


Ex Input:
['p', '4351', '9057', '1249']

Ex Output:

p