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]: ['5159', '6407', '4021', '6655', 'c', 'k', 'w', '7191', 'l', '4321', '1609', 'm', '1991', '9261', '511', 'p', '7495', 'b', 'e', '4647', '2711', 'd', 'y', '3835', '5037', '3613', '2695', '3367', 'm', 'j', 'y', '9561', '4889', 'a', 'z', '2253', 'p', 't', 's', '8371', '2859', 's']
[A]: a, b, c, d, e, j, k, l, m, p, s, t, w, y, z


[Q]: ['i', 'h', '8299', 'e', 'c', '5543', '5241', 'f', '3985', 'f', 'z', '1245', 'e', 't', 'g', '5199', '9217', 'q', 'j', 'p', '767', 'z', '1803', 'k', '7303', '3187', '2507', '6471', '3337', '6037', '9291', 'a', 'l']
[A]: a, c, e, f, g, h, i, j, k, l, p, q, t, z


[Q]: ['3969', 't', '6209', 'v', 'x', '6217', '4233', 'r', '5619', 'q', '171', '8603', '7277', 'v', 'a', '1525', 'c', '3487', '4429', '2699', '8989', 'z', 'u', 'w', '6053', '2145', 'f', '3593', '9367', 'k', '1319', '1469']
[A]:
a, c, f, k, q, r, t, u, v, w, x, z