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: ['u', '4021', 'u', 'd', 'j', 'p', 'i', 'z', '3223', 'f', 's', 'l', 'p', 'd', '5031', '1059', '7875', '2097', 'q', 'i', '8813', '2017', 'h', 'l', 'y', '57', '1561', 'f', 'j', 'z', '1901', 'u', 'j', 'x', '6561', '9239', '3333', '8793', '4915', '5821', 'h', 'f', '765', 'x']

A: d, f, h, i, j, l, p, q, s, u, x, y, z
****
Q: ['a', 'p', 'y', 'l', 'l']

A: a, l, p, y
****
Q: ['4577', '8825', '1577', 'd', '7963', 'p', '6147', 'v', '8619', 'u', '3193', '8783', '8505', '5591', 'f', 'n', '7881', '8025', '8879', 'h', '3175', 'u', 'q', '253', 'a', 'j', '7785', 'j', 'q', '2887', 'b', '1319', 'c', '1961', 'g', 'i']

A:
a, b, c, d, f, g, h, i, j, n, p, q, u, v
****