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]: ['7595', '5303', '3985', 'n', 'w', 's', 'r', 'f', '8237', 'q', 'y', 'f', '3121', '2463', '4597', 'q', '6801', 'f', 'i', '8563', '3267', 'k', '6157', 'f']
[EX A]: f, i, k, n, q, r, s, w, y

[EX Q]: ['u', '4731', 'l', 'p', '1997', '601', 'n', 'l', 'p', '211', '7355', '6537', 'w', 'x', '1741', '8145', '3689', 'm', 'y', '6945']
[EX A]: l, m, n, p, u, w, x, y

[EX Q]: ['t', 'z', 'm', '5911', 'q', 'a', 'n', '4311', '6855', 's', '7593', '8149', 'f', '6357', 'k', '5429', 'h', '4483', 'm', 'b', '7423', 'u', 'j']
[EX A]:
a, b, f, h, j, k, m, n, q, s, t, u, z