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: ['5433', '4011', '2113', '2299', 'e', '9829', 'd', 'q', 'e', '3921', 'a', 'q', '8953', 'q', 'g', 'w', 'z', 'u', '4425', 'b', 'q', '5315', 'b', 'u', 'h', 'y', '9733', 'b', 'c', '1225', 'a']

A: a, b, c, d, e, g, h, q, u, w, y, z
****
Q: ['2799', '7519', '345', 'e', 'l', '9369', '4703', '4111']

A: e, l
****
Q: ['9169', 'd', 'o', '33', 'a', 'o', '3167', 'c', '2359', 'r', 'm', '6865', '7797', '5473', '8905', 'j', '9319', 'u', 'y', 'a', '3117', '7789', '9837', '6887', '317']

A:
a, c, d, j, m, o, r, u, y
****