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]: ['6209', 'x', 'j', 'w', '7965', '4905', '6297', '4291', '7183', 'a', 'l', '5267', 'r', '5935', 'a', '7865', 'h', 'p', '6117', 'a', 'y', 'y', 't', 'v', '7271', 'e', 'e', 'z', 'i', 'l', '4731', '2059', 'm', '5703', 'k', 'f', '8125', 'e', '7569', 'r', '2287', '593']
[A]: a, e, f, h, i, j, k, l, m, p, r, t, v, w, x, y, z


[Q]: ['7473', '1283', '3063', 'z', 'l', 'd', '899', '6401', 'g', 'u', 'j', 'y', 'f', '3541', '975', 'y']
[A]:
d, f, g, j, l, u, y, z