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: ['d', '1625']

A: d
****
Q: ['331', '125', 'u', 'a', 's', '6995', 'i', '3613', '9727', '7087', 'l', 'b', '8291', '813', 'i', '1169', '2159', 'd', '1451', 'q']

A: a, b, d, i, l, q, s, u
****
Q: ['7315', 'j', 'e', 'l', '3197', '1653', 'q', '4793', '3175', 'j', '6639', 'n', '577', '2719']

A:
e, j, l, n, q
****