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: ['163', 'x', 'g', '5997', 'm', 'l', '7225', '7907', '375', 'y', 'a', 'j', 'c', 'j', '7755', '147', 'h', '3845', 'y', 's', 'h', 'u', '8737', '6091', 'j', 'f', 'c', '7395', '881', '1771', 'y', '3691', 'h']

A: a, c, f, g, h, j, l, m, s, u, x, y
****
Q: ['6249', '1235']

A: -1
****
Q: ['e', 'j', 'q', '1689', 'y', '2059', 'd', 'n', '2055', '6759', '9481', 'v', '2823', 's', '9121', 'k', 'y', 'e', '2445', '1083', '5833', 'o', 'v', 'i', 'n', 'b', '2149']

A:
b, d, e, i, j, k, n, o, q, s, v, y
****