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]: ['z', '8407', 'y', 'h', '1377', '3511', '1449', 'z', '3991', 'n', 'x', 't', 'h', '6389', '8049', '6091', '7787', 'p', 'l', '5815', 'k', 'e', 's', 'a', '9491', 'w', '1909', '4801', '4725', 'i']
[A]: a, e, h, i, k, l, n, p, s, t, w, x, y, z


[Q]: ['5089', '6113', 'v', 'l', '5529', 'q', '7499', 'e', 'r', 'c', '5999', '2619', 'a', '2523', '7697', 'j', 'c', '6537', '8313', '5623', '4225', '7677', 'q', 'a', '6559', 'y', 'b', 'm', '7645', '7019', 'r', 'i', '5225', '703', 'i', '6189', 'f', 't', '7553']
[A]: a, b, c, e, f, i, j, l, m, q, r, t, v, y


[Q]: ['p', 'q', '6163', 'e', '5421', 's', '9123', 'f', '9303', '5027', '8987', '9661', '1965', '8569', 'd', '1973', 'i', 'n', 'a', '3061', 'y', '3431', '8961', '4719', '6125']
[A]:
a, d, e, f, i, n, p, q, s, y