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.

[EX Q]: ['2313', '2073', 'd', 'e', 'o', '793', '4999', 'f', 'c', '4473', '4519', 'u', 'n', 'k', '69', '475', 'a', 'j', 'q', 'x', '5869', '9523', 'z', 'v', '9265', '5989', 'p', 'm', 'g', 'y', 'b']
[EX A]: a, b, c, d, e, f, g, j, k, m, n, o, p, q, u, v, x, y, z

[EX 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']
[EX A]: a, c, g, l, m, n, o, p, q, s, w, z

[EX Q]: ['i', 'n', 'q', 's', 'g', 'v', 'c', '2223', 'u', 'l', '6431', '9831', '3325', '3241', 'w', 'k', '3511', '8839', '891', 'j', 'd', '3885', 'n', 'l', '6525', 'a', '3381', '1343', 'i']
[EX A]:
a, c, d, g, i, j, k, l, n, q, s, u, v, w