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', 's', 'z', 'v', '5401', 'u', '8859', 'i', 'l', 'a', 'p', 'v', 'v', 'o', '3969', '4091', 'y', '6827', '1799', '5163', 'd', 'w', '4795', '5167', 'x', 'q', '2903', '1171', '5279', '449', '7901', 'u']

A: a, d, i, j, l, o, p, q, s, u, v, w, x, y, z
****
Q: ['c', 'h', '8655', 'r', '7531', 's', 'r', 'w', 'e', 's', 'p', '1709', '5447', 'b', '5855', 'w', 'f', 'i', '7809', 'q', '1975', 'z', '4037', 'k', 'l', 'z', 'g', '9739', '8801', '3405', '6549', '4561', 'd', '1669']

A: b, c, d, e, f, g, h, i, k, l, p, q, r, s, w, z
****
Q: ['9107', 'v', '3727', 'm', 'l', 'x', '5093', '2929', 'g', 't', '8731', 'u', 't', '3779', '5137', 'd', 'b', '299', 'r']

A:
b, d, g, l, m, r, t, u, v, x
****