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]: ['2161', '8009', '3057', 'r', '3897', 'd', 'j', '2727', 'b', '3231', 'i', '9227', '393', '5799']
[A]: b, d, i, j, r

[Q]: ['2381', 'y', '6631', '5839', 'r', 'm', 'z', 'b', '4663', '595', '7771', '5305', '5087', '3317', '3125', '9551', '4343', '5121', 'm', 'i', '131', '8401', '5379', '1775', 'u', '1125', '9793', '4123', 'h', '1613']
[A]: b, h, i, m, r, u, y, z

[Q]: ['i', 'a', '7297', '2521', 'i', '9247', 'c', 'c', '5817', '3691', '4995', '4811', 's', '6209', '9431', '7351', '8539', '3185', 'c', '2449', 'j', '7655', 'f', 's']
[A]:
a, c, f, i, j, s