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.

[EX Q]: ['9013', 'e', 'm', 'p', 'k', '161', 'k']
[EX A]: e, k, m, p

[EX Q]: ['b', 't', '2199', 'e', 'i', '1883', '5137', '8495', 't', '7377', 'm', '7665', '2009', 'o', '3757', 'm', '861', 'm', 'l', '9229', 'c', 'r', 'q', 'i', 'm', '705', 'b', '4301', 'd', 'l', 'f', '5485', 'h', 'p', '4529', '7879', 'f', 'b', 'm']
[EX A]: b, c, d, e, f, h, i, l, m, o, p, q, r, t

[EX Q]: ['i', '5019', 'v', 'm', '2283', 'b', '581', '8561', 't', '7055']
[EX A]:
b, i, m, t, v