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: ['3019', 'g', 'q', 'u', '611', 'z', '3671', '8119', '1679', 'h', '2631', '655', 'k', '2837', 'e', 'f', 'e', 'f']

A: e, f, g, h, k, q, u, z
****
Q: ['q', '9549', 'c', 'z', 'n', '3651', 'l', '2589', 'o', 'j', '8907', 'y', 'b', 'w', '2401', '269']

A:
b, c, j, l, n, o, q, w, y, z
****