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]: ['7065', 'f', 'k', 'i', 'd', '8291', 'z', 'e', 'q', '5345', 'h', '3397', 's', '5355', 's', '9033', 'e', '5241', '5285', 'm', 'h', 'i', 'n', '6471', '3365', 'f', 'r', '6145', 't', '4869']
[EX A]: d, e, f, h, i, k, m, n, q, r, s, t, z

[EX Q]: ['2459', '3709', 'f', '8673', '9313', 'm', 'd', 'g', 'c', 'g', 'u', 'f', 'p', 'i', '8771', '3613', '9669', '6221', '1211', '8331', '2295', 'b', 'f', 'm', '1377', '9831', '1751', 'k', '4831', 'm', '2747', '3435', '4543', 'c', '1729', 'e', '7093', '397', 'm', '383', '2019']
[EX A]: b, c, d, e, f, g, i, k, m, p, u

[EX Q]: ['c', 'y', '9535', '1245', 'e', 'j', 'a', '6151', 'd', '3279', '395', 't', 'y', 'u', 'o', '6217', 's', 'f', '7347', '1769', 'q', '7797', 't', 'b', 'c', '3539', '7877', '7261']
[EX A]:
a, b, c, d, e, f, j, o, q, s, t, u, y