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]: ['m', '6443', 'd', 'o', 'p', 'q', '3765', 'k', 'm', 'y', 'j', '3531', 'y', 't', '671', 'j', '3699', 'a', 'i', '1843', 't', 'd', '1205', 'k', 'h', '1209', '2913', '1301', 'k', 'd', '1769', '7985', 's', 'p', 'f', '4583']
[A]: a, d, f, h, i, j, k, m, o, p, q, s, t, y


[Q]: ['r', 's', '3409', 'a', 'e', '6855', 'i', 'n', '8655', 's', 't', '8401', 'u', '9603', '8815', 'q', 'a', 'x', 'i', '8455', 'e', '5877', '3917', 'p']
[A]: a, e, i, n, p, q, r, s, t, u, x


[Q]: ['2301', 'h', 'k', 'p', '2577', 'i', 's', 'j', 'i', 'f', '1887', 'b', 'c', '4005', '4055', 's', '9547', 'b', '6631', 'u', 'u', 'q', 'p', '3875', '1621', '4763', 'w', 'y', 'x', 'i', '3465', '477', '1847', 'e', 'r', '3851', 'c', '8317', 'u', 'v', '4727', '533']
[A]:
b, c, e, f, h, i, j, k, p, q, r, s, u, v, w, x, y