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]: ['7417', '2597', '2633', '7721', 'v', 'l', 'p', '4389', 'l', '3965', '6279', 'm', 'v', 'o', 'd', 'o', 'h', 'd', 'r', 'e', '8993', '2711', 'o', 'q', '1399', 'i']
[EX A]: d, e, h, i, l, m, o, p, q, r, v

[EX Q]: ['8527', 'p', '4697', '8415', 'v', 'l', '2669', '2649', '4349', '4201', 'r', '7573', '2041', 'f', '8047', 'u', 'm', 'm', 'j', '5695']
[EX A]: f, j, l, m, p, r, u, v

[EX Q]: ['2161', 'z', 'd', '281', 'r', 'i', 'g', '4863', 'l', '2919', 'k', '6083', 'n', 'a', '7457', 'q', 'p', 'r', 'j', 't', '7347', '9101', '9475', 's', 'c', '9707']
[EX A]:
a, c, d, g, i, j, k, l, n, p, q, r, s, t, z