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: ['3821', '385', 'y', '8457', '6623', 'g', '5923', 'a', '7193', 'v', 'm', '8915', 'v', '5873', 'p', 't', 'w', 'y', '3617', 'h', 'w', 'j', '8047', 'u', '2271', 'v', 'a', '2181', 's', '1051', 'b', 'a', '9967', '987', 'z', '2255', '6349', '1249', '1397', 'q']

A: a, b, g, h, j, m, p, q, s, t, u, v, w, y, z
****
Q: ['6209', 'x', 'j', 'w', '7965', '4905', '6297', '4291', '7183', 'a', 'l', '5267', 'r', '5935', 'a', '7865', 'h', 'p', '6117', 'a', 'y', 'y', 't', 'v', '7271', 'e', 'e', 'z', 'i', 'l', '4731', '2059', 'm', '5703', 'k', 'f', '8125', 'e', '7569', 'r', '2287', '593']

A: a, e, f, h, i, j, k, l, m, p, r, t, v, w, x, y, z
****
Q: ['m', 'j', '5087', '2541', '8163', '2935', '573', 'm', '7857', 'f', '9813', '1763', '9569', '989', 'r', '6969', 'd', '8449', 'a', '7241', '1471', '4941', 'e', 'g', '6051', 's', 'v', 'j', '5693', 'p', 'v', 'u', 'c', 'l', 'm', 'f', '1351', '3831', '4863', '855', '6159', '9561', '7801', '2771']

A:
a, c, d, e, f, g, j, l, m, p, r, s, u, v
****