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: ['9555', '5983', '1853', 'c', 'z', 't', 'p', '9041', 'd', '5919', '1621', '345', 's', '2647', '4261', '8611', 'w', 'x', 'p', '9103', '2599', '5101', '9261', 'k', '7437']

A: c, d, k, p, s, t, w, x, z
****
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: ['s', '37', 'c', 'u', '3027', 'n', '3045', 'm', '905', '7757', 'z', '8523', '6469', '7039', 't', '8109', 'a', '8407', 'q', '7931', 'u', '2485', 's', 'q', '3721', '8599']

A:
a, c, m, n, q, s, t, u, z
****