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: ['8815', 'w', '8629', 'y', '3891']

A: w, y
****
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: ['f', 'k', '1641', 'n', 'y', '7823', '7707', '2071', '8653', 't', 'd', '4565', 'y', 'h', '2961', '4321', '7805', '6643', '5985', 'm', '2289', 'z', '8811', 'q', 'j', 'l', '8387', 'c', 'p', 'n', 'l']

A:
c, d, f, h, j, k, l, m, n, p, q, t, y, z
****