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]: ['e', 'n', 'y', 'f', 'l', 'h', '455', 'y', '591', 'm', '9041', 'b', 'b', 'o', '4215', '5009', 'o', 'a', '4369', 'u', '6911', '4825', 't', 'k', '6063', '2939']
[A]: a, b, e, f, h, k, l, m, n, o, t, u, y


[Q]: ['9483', '501', 'j', 'k', '3103']
[A]: j, k


[Q]: ['c', '9871', 'j', '2173', '9987', 'f', '3995', '8735', '3919', 'p', 'n', '8891', 't', 'o', 'b', 'd']
[A]:
b, c, d, f, j, n, o, p, t