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: ['g', '6867', '7965', '3313', 'k', '1827', '7337', 'u', '1209', '5145', 'w', 'h', '9059', 'u', 'b', '3189', '2837', 'k', 'y', 'e', 'b', '4479', '541', '7103', 'h', 'm', '2177', '6377', '3993', '7167', 'q', '2145', '5007', '9135', '5331', 'e']

A: b, e, g, h, k, m, q, u, w, y
****
Q: ['6585', 'i', 'p', '5623', '3557', '8011', 'c', '6389', 'h', 'h', 'd', '1823', '5567', 'v', 'p', 'x', 'c', '2161', '3649', 'o', '6227', 'f', '9975', 'd', 'm', '2587', 'o', 't', 'k', '7637', 'm', 'l']

A: c, d, f, h, i, k, l, m, o, p, t, v, x
****
Q: ['n', 'h', 'i', '1439', 'q', '7043', '5711', 'c', '6351', '997', '4575', '4479', '1267', 'v', 'g', '9435', '3151', 'a', '9423', 'u', 'k', 'h', 'f', 'f', '8831', 'v', '9161', 'e', 'x', '7209', 'a', 'b', '61', 'a', '7081', '8407', '9219', '261']

A:
a, b, c, e, f, g, h, i, k, n, q, u, v, x
****