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: ['v', '5433', 'v', '6749', '7491', 'i', 'm', 'e', '5815', '8423', '833', '7359', 'm', 'i', 'f', 'u', 'p', 'j', 't', '3171', '6165', 'q', 'a', '9475', 'm', 'q', '5995', '8443']

A: a, e, f, i, j, m, p, q, t, u, v
****
Q: ['9689', '9727', 't', 'd', '2103', 'c', 'n', '8553', '4559', '7815', 'u', 'l', 'c', 'e', 'u', 'n', '7207', '4875', '7699', 'h']

A: c, d, e, h, l, n, t, u
****
Q: ['5623', '7733', '1967', '5065', 'f', '2709', '7165', 'l', '8245', 'f', '3457', '1687', '8131', '3819', '1939', 'z', '6425', '1581', 'l', '5083', '5731', '2573', 'j', '9257', 'z', '6963', '6863', '6289', 'a', 'j', 'x', 'g', 'y', 'o', 'v']

A:
a, f, g, j, l, o, v, x, y, z
****