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.

Q: ['907', '2407', '1385', '3593', 'x', '4143', '2271', '8361', 'q', '5093', 'd', '257', 'm', 'a', '5751', '7845', '3925', '3517', '7753', 'e', '5803', '2629', 't', 'e', '845', '6157', '9787', '225', 'j', 'j', 'l', '1321', 'k', '2459', 'u', '9113', '3193', 'a', 'j', 't']

A: a, d, e, j, k, l, m, q, t, u, x
****
Q: ['a', '7599', 'i', '9455', '3955', '2015', 'j', '7345', 'x', 't', 'c', '1317', '9155', '6383', '7793', 'n', '5581', 'v', '3485', 'n', 'r']

A: a, c, i, j, n, r, t, v, x
****
Q: ['m', 'i', 'c', '3077', 'r', '397', 'a', '8817', 's', 'f', 't', '6301', '9329', 'x', 's', '4437', 'm', '1805', 'f', 'c', 'y', 'y', 'j', '3309', '1601', 'i', '2891', '6937', 'x', '9207', 'f', 'p', '7801', '9101', 'w', '293', 's']

A:
a, c, f, i, j, m, p, r, s, t, w, x, y
****