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]: ['p', 'v', '1099', 'y', '1313', 's', '181', 'u', 'e', 'u', '8435', '4125', '8661', 'c', '4605', 'f', 'x']
[A]: c, e, f, p, s, u, v, x, y


[Q]: ['y', 'p', 'q', '2157', 'b', 'w', '8875', 'k', 'i', 'd', '9743', '4941', 'b', 'p', '9941', '495', 'h', 'i', '839', 'c', 'h', 'f', 'b', 'a', 'k', 'z', '7549', '4149', 'h', 'j', '1947', 't', 'f', 'c', '1243']
[A]: a, b, c, d, f, h, i, j, k, p, q, t, w, y, z


[Q]: ['l', 'n', '6533', '5909', '1171', '4355', 'x', 'i', '329', '6445', 'b', 'e', 'g', 'f', '1893', '4045', 'n', '4559', '7789', 'q', '8815', '9397', '443', 'd', 'o', '9085', '3227', '6319', '43', '375', 'y', 'r', 'z', 'i', '5717', 's', 'l']
[A]:
b, d, e, f, g, i, l, n, o, q, r, s, x, y, z