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]: ['p', 'f', 'h', '1977', '6221', 'i', 'a', 'l', '5225', '8059', 'c', 'w']
[A]: a, c, f, h, i, l, p, w


[Q]: ['7677', '4069', 'b', 'w', '4381', 'b', '5757', '711', '765', '8347', '6547', '9527', '945', '5333']
[A]: b, w


[Q]: ['8165', '389', '2875', '3327', '9739', '7437', 'r', '9931', '5', '6497', 'i', '55', '6053', '4195', '809', 'a', 'd', '1471', '3485', '7543', 'u', '8625', 'q', '767', '3517', '1565', '975', '9339', '5549', 'n', '8259', 'n', 'r', '1135', '9057']
[A]:
a, d, i, n, q, r, u