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.

['9013', 'e', 'm', 'p', 'k', '161', 'k']
e, k, m, p

['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, c, g, l, m, n, o, p, q, s, w, z

['b', '1613', 'm', 'u', '9707', 'v', '4349', 'm', '5077', 'n', '3485', '9869', 'k', '1971', '1035', 'r', '5793', 'q', 'u', '5803', '941', '2227', 'v', 'o']

b, k, m, n, o, q, r, u, v