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:
['1653', '3177', 'b', '2785', '2515', 'd', '5513', '5599', '2947', 'v', '2771', '5697', '2913', '4161', '5939', '2655', '6787', '9851', 'q', '3199', 'x', '1305', '9423', '9117', '4821', 'j', '7963', 'i', 's', '469', 'r', 'w']

Ex Output:
b, d, i, j, q, r, s, v, w, x


Ex Input:
['j', 'r', 'z', 'f', '1485', '2419', 't', 'd', '6023']

Ex Output:
d, f, j, r, t, z


Ex Input:
['3275', '1279', 'w', 'n', 'p', 'x', '119', 'e', 'v', '4863', '2317', '5357', '6423', '1035', 'd', '9303', 'c', '5329', 'j', '665', '3737', '9843', '8539', 'x', '1851', '6003', '2077', 'q', 'x', 't', '3339']

Ex Output:

c, d, e, j, n, p, q, t, v, w, x