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: ['r', '9489', 'e', 'n', '6323', 'd', '3163', '265', '8587', '7891']

A: d, e, n, r
****
Q: ['x', '4283', 'n', 'b', 'g', 'p', '8305', '7781', '5907', 's', '1305', 'w', '8623', 'o', 'c', 'u', '1839', '2869', '7537', 'y', '2395', '5309', 'e', '4059', 'l', '6647', 'p', '9717', 'y', 'y', '3769', '2527', '2981', '5255', '4063', 'j', '4843', 'j', '9355', 'z']

A: b, c, e, g, j, l, n, o, p, s, u, w, x, y, z
****
Q: ['b', 'c', '9711', '3235', 's', 'c', '7617', 'm', '5333', '8689', 'v', 'r', 'e', '8299', '4213', '8521', 'z', 'f', '5223']

A:
b, c, e, f, m, r, s, v, z
****