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]: ['z', 'l', '1759', 'k', '8197', 'v', '931', '2587', '7219', '3455', 'e', '8135', 'm', 'n', 'm']
[A]: e, k, l, m, n, v, z


[Q]: ['395', '8309', 'v', 'r', 'x', 'j', 'l', 'b', 'c', 'c', '3123', 't', 'a']
[A]: a, b, c, j, l, r, t, v, x


[Q]: ['e', 'e', 's', 'p', '8861', '4589', 'q', 'l', '8977', 'e', '9379', 'z', 'd', 'c', 'l', 'i', '931', '8757', '691', '3091', 'r', 's', '6719', '5523', 'g', 's', 'd', '1471', '2679', '1209', '1129', 'z', '6015', 'w', '4467', 'w', '2237']
[A]:
c, d, e, g, i, l, p, q, r, s, w, z