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: ['k', '6595', '1595', 'v', 'h', 'b', '8815', '6681', 'j', '7581', 'p', '9095', '5453', 'r', 'y', '7755', 'x', '1853', 'k', 'q', 'u', 'j', 'q', '9651', 'o']

A: b, h, j, k, o, p, q, r, u, v, x, y
****
Q: ['q', 'g', 's', 'g', 'z', '987', '777']

A: g, q, s, z
****
Q: ['f', '9537', 'p', 'f', '5581', 'j', 'f', '3141', 'q', 'z', '8719', 'k', '8969', 'h', 'e', '323', 'n', '5009', 'm', 'u', 'g', '641', 'w', '597', '8717', 'p', 'u', 'm', '8929', 'w', 'l', 'v', 'k', 'o', '3747', '3135']

A:
e, f, g, h, j, k, l, m, n, o, p, q, u, v, w, z
****