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: ['5611', 'x', 't', 'p', '5711', '7079', '5251', '429', 'z', 'u', '8721', '9321', '79', 'i', '189', '3605', 'k', '445', 'r', 'k', 'o', '2189', '8521', '8849', '2651', 'm', '4149', '1577', '3085', '5275', '6413', '5265', '6089', 'r', 'f', '5013']

A: f, i, k, m, o, p, r, t, u, x, z
****
Q: ['9555', '5983', '1853', 'c', 'z', 't', 'p', '9041', 'd', '5919', '1621', '345', 's', '2647', '4261', '8611', 'w', 'x', 'p', '9103', '2599', '5101', '9261', 'k', '7437']

A: c, d, k, p, s, t, w, x, z
****
Q: ['4921', 'f', 'u', 'k', '9471', 'e', '6691', '999', '8381', 'b', '789', 'h', 'v', '2019', 'f', '8313', '9067', '9403', 'x']

A:
b, e, f, h, k, u, v, x
****