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: ['2393', 'c', '4413', '5529', '1487', '2499', 'i', 's', 'i', '8575', 'm', 'z', '7179', '6637', '9181', 'z', 'h', '2487', 'i', '3779', '2017', '5217', '5013']

A: c, h, i, m, s, z
****
Q: ['u', '2597', 'b', 'b', '8747', '2325', 's', '1859', '6523', 'q', '7805', 'v', 'o', 'i', 'p', 'v', '7719', '5167', '1203', 'e', 'p', 'q', 's', 'q', 'l', 'n', 'e', '1663', 'l', 'c', '587']

A:
b, c, e, i, l, n, o, p, q, s, u, v
****