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: ['w', '491', 'x', 'u', 'z', 'q', '5411', '7629', '8261', '8629', '1441', '5139', 's', 'm', '6463', 'u', 'z']

A: m, q, s, u, w, x, z
****
Q: ['t', 'm', '7071', 'j', '353', 'n', 'a', 'm', '9211', 'i', '9537', 'q', '7669', '869', '8753', '8071', '375', '9971', 'c', 'n', '5851', 'u', '2491', '2697', '2789', '4683', '879', 'q', 'g', 'p', 'd', 'x', 'r', 'i', '8171', '5449', '2477', '1151', 'z', '3845', '1079', 'j', 'n', 'p', '8199']

A: a, c, d, g, i, j, m, n, p, q, r, t, u, x, z
****
Q: ['9413', '4557', '2437', '6881', '4337', '3467', '4711', '7525', '5431', '3267', '6773', 'i', '8963', 'o', 'u', 'b', '5407', '9685', '8217', 'a']

A:
a, b, i, o, u
****