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: ['l', '7111', 'd', 'e', 'h', 'z', 'x', '5673', 'v', '8255', 'i', 'z', 'c', 'i', '4287', 'q', '9293', '9137', 'p', 'n', 'o', 'n', '7883', '6453', '7355', '8769', 'y', '9153']

A: c, d, e, h, i, l, n, o, p, q, v, x, y, z
****
Q: ['2165', 'f', '5081', 's']

A: f, s
****
Q: ['7147', 'h', 'a', 'w', '1735', '9143', 'p', '7243', 'c', 'm', 'a', '1447', 'c', 't', '2031', 'j', 'w', '727', 'g', '8971', '1123', '2569', '5135', 'g', 'g', 'o', 'x', '8139', '4323', '8209', '2833', 'z', '6687', '9863', '9909']

A:
a, c, g, h, j, m, o, p, t, w, x, z
****