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: ['5163', 'n', 'j', '67', '3801', 'n', '7113', 'z', '579', '6885', '8921', 'v', '5481', '5507', 'k', '8403', 'c', '837', 'u', '6341', 'd', 'i', '497']

A: c, d, i, j, k, n, u, v, z
****
Q: ['219', '2065', '4045', 'k', 'n', 's', 'z', '7239', '1043', 'r', '2333', 'q', 'k', 'b', '2013', 'g', '6925', '9835', 'a', '5377', 'k', '8005', 'p', '9753', 'm', '201', '2353', 'f', 'n', '89', 'q', 'p', '7847', 's', 'l', '3359', '2269', 'v', 'm', '8247', '9665', 'u', 'w']

A: a, b, f, g, k, l, m, n, p, q, r, s, u, v, w, z
****
Q: ['y', 'v', '6367', '407', '5665', '9995', 'f', '879', '7929', '693', 'd', 'k', 's', 'x', '1741', 'k', '5123', '7589', 'j', '3055', 'l', '3877', '3463', '9493', 'w', 'n', '2575', '1527', 'o', '9589']

A:
d, f, j, k, l, n, o, s, v, w, x, y
****