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: ['5181', '8651', '963', '2111', 'g', '7913', '8335', 'o', '1387', '9225', '6517', 's', 'r', '2291', '3699', 'y', 'y', '4223', 'i', '9109', 'm', 's', '8585', 'l']

A: g, i, l, m, o, r, s, y
****
Q: ['5089', '6113', 'v', 'l', '5529', 'q', '7499', 'e', 'r', 'c', '5999', '2619', 'a', '2523', '7697', 'j', 'c', '6537', '8313', '5623', '4225', '7677', 'q', 'a', '6559', 'y', 'b', 'm', '7645', '7019', 'r', 'i', '5225', '703', 'i', '6189', 'f', 't', '7553']

A: a, b, c, e, f, i, j, l, m, q, r, t, v, y
****
Q: ['r', '6017', 'e', 'k', '4241', '6325', 'c', 'd', '5557', 'u', 'h', 'x', '6795', 'c', '3907', 'n', 'j', '9947', 'b', '9123', '3855', '8385', '9579', 'm', 'p', '8851', '3891']

A:
b, c, d, e, h, j, k, m, n, p, r, u, x
****