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', '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: ['y', 'b', 'r', 'f', '3745', 'n', '2921', '8133', 'r']

A: b, f, n, r, y
****
Q: ['t', 'l', 'e', '227', 'h', '8981', 'v', 'x', '2909', 's', 'v']

A:
e, h, l, s, t, v, x
****