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]: ['j', 'r', 'z', 'f', '1485', '2419', 't', 'd', '6023']
[A]: d, f, j, r, t, z


[Q]: ['e', '8391', '7065', '6141', '3335', 't', 'i', 'c', '1791', '6333', 'b', 'z', '1621', 'e', 'h', 'u', 'o', 'q', '3195', '6507', '3253', 'c', '2067', '3917', '7111', 'r', 'j', 'd', '3987', '9139', 'm', '981', 'l', 'f', '2417', 'w', '9983', 'h', 'd', '6021', 'a', 'f']
[A]: a, b, c, d, e, f, h, i, j, l, m, o, q, r, t, u, w, z


[Q]: ['l', 'l', 'e', 'b', 'c', '7689', '8389', '8317', '3153', '789', 'p', 'y', 'g', '5615', '9875', 'q', 'j', 'r', '6229', '79', '1199', '6499', 'y', 'y', 'b', 'a', 'r', 'm', 't', 'c', 'a', '763', 's']
[A]:
a, b, c, e, g, j, l, m, p, q, r, s, t, y