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.

['r', 'q', '3649', 't', '3941', 'z', '3729', 's', 'g', '6905', 'h', 'v', '1085', '6353', 'a', '9395', '5433', 'a', '2565', 'p', 'a', 'h', '1491', 'j', 'b', 'v', 'e']
a, b, e, g, h, j, p, q, r, s, t, v, z

['n', 'w', '6735', '3427', '6115', 'q', '7851', '3645', 'g', '6825', '6515', '4885', 'z']
g, n, q, w, z

['2015', '6417', 'u', 'x', '4991', 'e', '6689', 'r', 'q', '1911', '4401', 'd', '1435', 'e', '711', '6203', '1455', 'u', 'l', 'r', 'c', '119', 'l', 't', '2417', 'k', '3449', 'b', '2605', 'q', 'n', '2427', 'q', '257', 's', 't', '53', 'o', '7847', '7621', 'i', '261', 'c']

b, c, d, e, i, k, l, n, o, q, r, s, t, u, x