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: ['d', 'r', '7769', '2159', 's', '3269', '5527', 'l', 'z', 'e', '5165', 'x', 'x', '8273', 'g', 'm', '7609', '4015', '6403', '3753', 'y', 'h', 'l', 'i', '389', 'm', 'u', '6845', 'r', 'c', '7571', '3355', '9755', 'n', '4625', 'p', '5645', '1703', '4439', 't', '8431']

A: c, d, e, g, h, i, l, m, n, p, r, s, t, u, x, y, z
****
Q: ['a', '533', '67', 'z', 'z', '9283', 'o', 'a', '7045', '1521', 'm', 'h', 'q', '4173', '7497', '319', '5721', '6097', 'i', '9829', '1801', '7347', 'r', 'z', '239', '4279', 'e', 'k', 'r', 'v', '6653', '599', '8597', 'd', 'r']

A: a, d, e, h, i, k, m, o, q, r, v, z
****
Q: ['g', '9103', '461', 'v', '647', '6443', '3221', 'k', 'j', '9361', 'v', '6137', 'j', '6093', 'y', '5433', 'u', '6085', 'b', '1959', 'c', 'f', '4631']

A:
b, c, f, g, j, k, u, v, y
****