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]: ['3583', 'd', '1481', 'w', 'l', '7261', '2933', 'n', '8725', 'g', '3441', 'r', '287', '7327', '5637', 'r', '5389', 'm', 'j', 'd', 'a', 'e', 'v', '7879', '1731', 'z', '43', 'q', 'p', '4315', 'p', '3651', 'o', 'l', 's', '9787', 'h', '6735']
[EX A]: a, d, e, g, h, j, l, m, n, o, p, q, r, s, v, w, z

[EX Q]: ['477', '3931', 'g', '5967', 'm', '9845', '1607', 'a', '1749', 'k', 'j', '7945', '9125', 'v', 'n', 's', '5185', '1117', '17', 'x', '4149']
[EX A]: a, g, j, k, m, n, s, v, x

[EX Q]: ['m', 'c', '5261', 's', 'u', '7969', '5047', 'y', '9555', '1139', 'k', 'l', '6645', '5411', '1765', '3979', '395', 'h', 'o', 'e', 'o', '7575', '5957', '6919', '8001', 'p', 't', '5365', '3915', 't', 'j', 'p', '9095', 'b', '57', '4377', '9395', 'r', 'h', 'y', '7535', '9575']
[EX A]:
b, c, e, h, j, k, l, m, o, p, r, s, t, u, y