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.

['6495', '2259', '8213', 'm', 'y', '3377', 'q', 'i', '1299', 's', 'w', '4331', 'h', '5459', '4059', '6637', '8069', '5367', '6025', 'l', 'v', '4503', 'd', 'x', 'w', '5067', '9019', 'd', '7919', '7299', 'v', '8957', 'v', '5341', '2617', '8169', 'n', 'y']
d, h, i, l, m, n, q, s, v, w, x, y

['6655', '7445', '1795', '7495', 'h', 'z', 'u', '2199', 'r', 'p', '2245']
h, p, r, u, z

['2637', 'y', '5915', 'o', '9963', '2295', 'd', 'm', 'v', '5047', 'k', '9131', 'j', 'v', '3871', 'x', '6721', '5517', 's', '2101', '1383', '7495', '4109', 'l', '3787', 't', 's', 'x', '709']

d, j, k, l, m, o, s, t, v, x, y