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', 'm', 'n', 'u', '9159', '7931', '5401', '1383', '8195', 't', 'x', 'q', 'r', '2535', 's', 'j', 'c', '8123', '2429', '5581', 'k', 'c', 't', 'i', 'm', 'o', 't', 'q', '4819', 't', '1649', 'r', 'y', 'z', '8813', '7451', '199', 'o', 'x', 's', 's', '6747']
[A]: c, i, j, k, m, n, o, q, r, s, t, u, x, y, z


[Q]: ['895', '2049', '8839', '1773', 'v', '467']
[A]: v


[Q]: ['9297', '8413', '3125', '5513', '3051', 'c', '9099', 'y', '3733', 'l', 'u', 'p', 'y', 'e', 'z', '929', 'g', '1425', 'r', 'a', 'y', '467', '291', 'l', '8785', '2175', '1993', '5837', '1589', 'u', 'l', 'w', 'p', '6877', 'l', 'p', '9181', '3813', 'b', 'i', '179']
[A]:
a, b, c, e, g, i, l, p, r, u, w, y, z