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: ['j', 'y', '9907', 'a', '5715', 'l', '9817', '1949', '2697', '2255', '9571', '8957', '9329', '6055', 'z', 'q', '1185', '4593']

A: a, j, l, q, y, z
****
Q: ['z', '5601', '5675', 'w', 's', 'z', '9213', '9563', '1699', 'p', 'g', 'm', 'c', '9279', '4481', 'p', 'n', '2389', 'c', '503', '1901', '8827', '1701', '1607', '5633', 'a', 'z', 'g', '3175', 's', 'l', 'l', '6811', '1821', '693', '8277', 'q', '8623', 'o']

A: a, c, g, l, m, n, o, p, q, s, w, z
****
Q: ['7123', '9465', '9733', 's', 'k', 'h', '2829', '6589', '5271', 'y', '6647', '6061', 'q', 'v', '3477', 'a', 'v', '9365', 'n', 'y', '3465', 'a', '5577', '6665', 'd', '8011', '2437', 'h', 'x', '1671', 'u', 'x', 'b', 'h', '557']

A:
a, b, d, h, k, n, q, s, u, v, x, y
****