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: ['6599', 'f', 'c', '661', 'q', 'e', '1951', 'f', 'f', 'a', 'd', '9521', '853', 'n', 'w', '6451', '5549', 'k', 't', 'l', 'z', 'm', 'k', '567']

A: a, c, d, e, f, k, l, m, n, q, t, w, z
****
Q: ['6175', '9441', '7127', '5979', 's', '1367', 'e', 'm', '7083', '1787', '8375', '2851', '3475', 'r', '697', 'g', 'z', 'm', '4207', 'c', '7971', 'z', '9339', 'd', 's', '3507', '9003', 'i', 'y', 'w', 'j', 'i']

A: c, d, e, g, i, j, m, r, s, w, y, z
****
Q: ['4019', 'f', '6293', '8065', 'l', 'g', 'h', 'n', 'g', 'q', 'e', '7429', 't', 'w', 'n', 'a', 'e', 'g', '5177', '3965', '8305', 'u', '7719', '9149', 'j', '8613', '851', 'j', 'i']

A:
a, e, f, g, h, i, j, l, n, q, t, u, w
****