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: ['8051', 'h', 'g', 's', 't', 'p', 'w', 'x', 's', '8521', 'm', '9719', 'j', 'n', 'i']

A: g, h, i, j, m, n, p, s, t, w, x
****
Q: ['z', 'm', 'n', 'u', '9159', '7931', '5401', '1383', '8195', 't', 'x', 'q', 'r', '2535', 's', 'j', 'c', '8123', '2429', '5581', 'k', 'c', 't', 'i', 'm', 'o', 't', 'q', '4819', 't', '1649', 'r', 'y', 'z', '8813', '7451', '199', 'o', 'x', 's', 's', '6747']

A: c, i, j, k, m, n, o, q, r, s, t, u, x, y, z
****
Q: ['i', 'q', 'f', '4593', '6585', '189', 'i', '9799', 'g', 's', '7869', '4325', '5967', 'l', '3977', '9721', 'g', 'o', '2681', 'y', 'i', 'f', '2585', '5813', '8635', '865', '6233', '4411', 'k', '6657', '3089', '7615', 'f', '3971', '6425']

A:
f, g, i, k, l, o, q, s, y
****