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: ['1223', 'h', 'a', 'o', 'v', '2535', 'g', '6267', 'w', '9625', '7961', '9577', '7611', '5655', 'p', 'j', 's', '2141', '4101', 'l', '4367', '9383', 'n', '5965', '9097', '7571', 'p', 'u', 'x']

A: a, g, h, j, l, n, o, p, s, u, v, w, x
****
Q: ['d', 'g', '9019', '9987', '8713', '9513', 'a', '2043', 'd', '5817', 'w', 'd']

A: a, d, g, w
****
Q: ['f', '901', '8505', '6325', '6667', 'v', 'h', 't', 'p', '8237', 'w', 'k', '3935', '9527', 'x', 'n', '73', '8559', '7017', 'r', '3983', 'f', '4287', 'g', '7595', '3615', '675', '3445', '75', '79', 'd', '2739', '7795', '5857', 'o', 's', '9171', '279', '4691', '9533', 't']

A:
d, f, g, h, k, n, o, p, r, s, t, v, w, x
****