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]: ['h', 'l', 'i', '1507', 'h', '409', '6777', 'u', '5563', '6113', '6513', '9949', '461', 'z', 'm', '2519', 'r', '4699', 'n', 'x', '4645']
[A]: h, i, l, m, n, r, u, x, z


[Q]: ['x', '4283', 'n', 'b', 'g', 'p', '8305', '7781', '5907', 's', '1305', 'w', '8623', 'o', 'c', 'u', '1839', '2869', '7537', 'y', '2395', '5309', 'e', '4059', 'l', '6647', 'p', '9717', 'y', 'y', '3769', '2527', '2981', '5255', '4063', 'j', '4843', 'j', '9355', 'z']
[A]: b, c, e, g, j, l, n, o, p, s, u, w, x, y, z


[Q]: ['j', 'v', '5531', '6719', 'm', '569', 'l', '8151', 'e', 'x', 'y', '4573', '6715', '6935', '4129', 'b', '8211', 'o', '6591', '4467', '557', '2081', 'p', 'c', 'i', '7003', '1709', 'u', 'z', '4791', '6383', '1397', 'a', '3953', '3759', 'p', 'j', '1005', 'g', '3897', '8067', '2655', 'h', '7645', 'c']
[A]:
a, b, c, e, g, h, i, j, l, m, o, p, u, v, x, y, z