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', '4447', 'g', 'o', 'j', 'p', 'l', 'q', 'o', '8777', 'r', 'v', '961', '6083']
[A]: g, i, j, l, o, p, q, r, v


[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]: ['1945', 'n', 'p', 'c', '1231', 'w', '529', 'x', 'u', 'y', '9445', 'p', 'g', 'l', 'e', '6661', 'f', '8603', '5057', '2735', '8505', 'y', '5907', 'r', '1463', 'i', '289', 'p', '9327', '8041']
[A]:
c, e, f, g, i, l, n, p, r, u, w, x, y