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]: ['5163', 'n', 'j', '67', '3801', 'n', '7113', 'z', '579', '6885', '8921', 'v', '5481', '5507', 'k', '8403', 'c', '837', 'u', '6341', 'd', 'i', '497']
[EX A]: c, d, i, j, k, n, u, v, z

[EX Q]: ['7917', '2295', 'q', 'v', '9373', 'w', 'n', 'q', '5803', 'g', 'k', 'm', '2167', 'k', '6425', 'x', 'g', '341', 't', 'u', '8829', 'h', '4333']
[EX A]: g, h, k, m, n, q, t, u, v, w, x

[EX Q]: ['9201', '4709', 'b', 'v', '7481', '125', '1407', 'a', 't', '9813', '8073', '2273', 't', '9747', 'v', 'q', 'g', 'l', 'e', '2237', '7789', '4701', '9163', '8839', 'p', '1593', 'g', 'l', '7593', 'g', '1649', '6317', '4301', 'v', 'a', 'x', '8479', 'v']
[EX A]:
a, b, e, g, l, p, q, t, v, x