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]: ['d', '5285', 'z', 't', 'i', '719', 'z', 'b', '3603', '4781', 'o', 'g', 'j', 'd', 'r', 'a', 'x', '5829', '4907', '7395', '993', '2109', '1745', '415', '7525', '1029', '7791', '5321', 'h', '6391', 'g', '4613', '9191', 'o', '7365', '1811', '9695', 'w']
[A]: a, b, d, g, h, i, j, o, r, t, w, x, z


[Q]: ['u', '4731', 'l', 'p', '1997', '601', 'n', 'l', 'p', '211', '7355', '6537', 'w', 'x', '1741', '8145', '3689', 'm', 'y', '6945']
[A]: l, m, n, p, u, w, x, y


[Q]: ['8505', '5211', 'f', 'y', 'a', 'h', 'x', 'w', '5561', 'm', 'z', 'n', '4689', '3499', '6291', 'y', 'f', '9493', '3419', 's', 'b', '2737', 'm', '4169', 'b', '3629', 'v', 'a', '4477', '533', 'n', 'f', '5029', 't', 'w', '5471', '9661', '3521', 'c', 'f']
[A]:
a, b, c, f, h, m, n, s, t, v, w, x, y, z