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', '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]: ['6027', 'v', 'b', 'l', '7853', 'r', 'y', '2919', '3831']
[A]: b, l, r, v, y


[Q]: ['8537', '6923', '5811', 'a', 'y', 'e', 'z', 'y', 'k', '9145', 'o', 'y', 'k', 'm', 'k', 'x', 'e', '4977', 'm', '8407']
[A]:
a, e, k, m, o, x, y, z