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]: ['c', '1693', 'l', 'u', 'x', '3609', 'h', '4159']
[A]: c, h, l, u, x


[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']
[A]: a, d, e, g, h, j, l, m, n, o, p, q, r, s, v, w, z


[Q]: ['a', '3525', 'v', 'q', '4095', '7491', '6301', 'o', '5045', 'm', 'h', 'h', '4801', 'q', '4971', '1979', 'l', '6267', '4887', '4671', '8429', 'k', '4623', 'z', '4779', 'p', 'r', 'x']
[A]:
a, h, k, l, m, o, p, q, r, v, x, z