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]: ['5785', 'c', 'f', '7087', 'd', '9225', 'm', 'g', '4639', '7165', '3445', '3813', 'p', 'i', '719', 's', 'g', '6423', '9563', 'w', 'm', '8659', '8809', '4105', '3923', '465', '5637', '5547', 'h', 'v', '9453', '4009']
[A]: c, d, f, g, h, i, m, p, s, v, w


[Q]: ['q', 'g', 's', 'g', 'z', '987', '777']
[A]: g, q, s, z


[Q]: ['b', '9425', 'e', 'z', 'o', '5551', 'v', '4683', '9911', 'h', 'j', '5403', 'a', '8413', 'o', '2549', 'b', '3173', 'c', 'z', 'i', 'o', 'l', '7747', 'm', '9877', '1289', 'm', '2081', 'a', '3459', '4559', 'g', '6413', 'l', 'd', '1329', 'x', 'g', 'v', '7825', 'y', 'q']
[A]:
a, b, c, d, e, g, h, i, j, l, m, o, q, v, x, y, z