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: ['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: ['m', '3809', 'l', 'k', '1929', '7963', 'n', 'u', '2125', 'g', 'o', '8325', 'o', 'h', 'y', '3025', 'e', 'e', 'c', 'x', '8445', '4979', 'z', 'f', '4201', '4765', 'g']

A: c, e, f, g, h, k, l, m, n, o, u, x, y, z
****
Q: ['3635', 'r', 'z', 'd', '3773', '9231', '4231', '4011', 'b', '2947', 'c', 'f', 'k', 'd', '3673', '8377', '7971', '9659', 'j', 'a', '565', '4659', '2185', '5423', 'q', 'i', 'w', '2739', 'r', '833', '5235', 'p', 'b', '6723', '2139', 'u', '1773', '693', 'h', '9065', '6533', 'k', '5191', '5753']

A:
a, b, c, d, f, h, i, j, k, p, q, r, u, w, z
****