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:
['3307', 'r', '2665', '3453', 'f', 'd', 'v', '3801', '3153', '3137', 'y', 'i', '9681', 'k', '9253', 'y', 'i', '8631', '2375', '5131', 'r', 'z', '8645', '595', 's', '6749', '2665', '709', '8203']

Ex Output:
d, f, i, k, r, s, v, y, z


Ex Input:
['3561', 'd', '9697', 'd', '7761', 'a', '2833', 'c', '2921', 't', '691', 'g', '4797', 'b', '3913', 'f', 'q', '7807', 'j', '3577', 'j', '1775', '2897', '2589', '993', '8595']

Ex Output:
a, b, c, d, f, g, j, q, t


Ex Input:
['6905', '1161', '7387', '89', 'h', 'k', 'p', '5397', 'd', 'e', 'm', '7311', '7619', 'o', 'f', 'i', '6857', '7333', '4131', '3803', 'm', 'y', '9345', '9577', 'k', '7735', 'j', '3685', 'u', '1755', '7547', 'w', '2297']

Ex Output:

d, e, f, h, i, j, k, m, o, p, u, w, y


