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]: ['i', '1191', '5581', '2527', 'g', '9795', '519', 'u', '8389', '9793', 'k', '5733', '7125', '7835', 'j', '855', 'd', 'd', '6555', '3211', 'l', 'o', 'b', '523', 'x', 'j', '1707', '4161', '7171', 'h', 'h', 'm', 'h', '2443', 'e', '649', '951', 'n', 'h']
[A]: b, d, e, g, h, i, j, k, l, m, n, o, u, x


[Q]: ['2527', '9123', '8717']
[A]: -1


[Q]: ['9473', '6693', '5357', 'z', '8141', '333', 'i', 'f', '2781']
[A]:
f, i, z