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]: ['e', '8391', '7065', '6141', '3335', 't', 'i', 'c', '1791', '6333', 'b', 'z', '1621', 'e', 'h', 'u', 'o', 'q', '3195', '6507', '3253', 'c', '2067', '3917', '7111', 'r', 'j', 'd', '3987', '9139', 'm', '981', 'l', 'f', '2417', 'w', '9983', 'h', 'd', '6021', 'a', 'f']
[A]: a, b, c, d, e, f, h, i, j, l, m, o, q, r, t, u, w, z


[Q]: ['r', 's', '2471', 'n', '635', 'k', '3551', '7041', '8765', '1221', '8439', '7773', '6471', 'u', 'p', '2093', '6479', '1435', '6881', 'a', 'y', 'm', 'r', '1627', 'w', 'k', 'b', '3095', '9059', '285', 'y', 'a', 'm', 'x', '637', 'i', '3407', 'e', 'e']
[A]: a, b, e, i, k, m, n, p, r, s, u, w, x, y


[Q]: ['h', 'w', '2011', 'z', 'r', '89', '5139', 'z', '6605', 's', '5613', 'l', '4119', '4767', 'p', '3645', '6519', 'o', '1979', 'm', '3521', 'm', '1709', '3765', 'a', '9179', 'x', 'd', 'k', '6111', '8937', 'z', 'r', 'm', 'f', 'o', '6061', '8063', 'b', '9103']
[A]:
a, b, d, f, h, k, l, m, o, p, r, s, w, x, z