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]: ['a', 'y', 'v', 'f', 'x', 'k', 'f', 'j', '6245', '6289', 'd', '6909', '8701', 'm', '3277', 'f', 'j', 'j', '9227', '8663', '5771', 'j', 'n', 'u', '7837', 's', '2539', '6363', 'g', 'a', '1009', 'v', '1483', 'x', 'i']
[A]: a, d, f, g, i, j, k, m, n, s, u, v, x, y


[Q]: ['x', 'j', '9747', 'i', '2015', '3505', 'q', 'n', 'h', '3011', 'u', '8043', 'j', 'f', 'd', 'a', 'p', '5817', 'l', 'q', '2275', 'n', '7085', '5373', 'l', 'g', 'b', '8043', '3085']
[A]: a, b, d, f, g, h, i, j, l, n, p, q, u, x


[Q]: ['7439', '6435', '8191', '9745', '5609', 'm', 'i', 'i', '1461', 'h', '5721', '749', 'd', '7141', 'm', 'm', '3001', '9069', 'z', '8741', 'u', 'r', '4813', '7217', '9797', '2489', '6675', '893', 'f', 'n', 'j', '6241', '7647', '5271', '1007', 'c', '8269', '7689', 'p', '2839', 'y', 'f', '6607', '2511']
[A]:
c, d, f, h, i, j, m, n, p, r, u, y, z