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: ['a', 'a', 'b']

A: a, b
****
Q: ['a', 'e', 'v', '7255', 'x', 'p', '8827', '2031', 'g', '7417', '1319', '7063', '9273', '5307', '8859', '6737', '7621', '899', '3391', '2371', '3833', 'x', '9569', 'y', 'y', '429', '7139', 'z', '1297', 'q', 'p', 's', 'i', 'v', 'z', 'd', '521', 'n', '705', 'v', 'g']

A:
a, d, e, g, i, n, p, q, s, v, x, y, z
****
