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]: ['9467', 'o', '8347', '7125', '7999', '1737', 'h', '7043', '8617', '2033', '9959', '2349', 'p', '9389', '5525', 'w', 'u', 'p', '4703', '9807', 's', 'f', '2359', '7357', '2471', '5447', 'f', 'w', '2865', '6627', '3211', 'y', '23', 'z', 's', '1517', '3553', 'r', '2251']
[A]: f, h, o, p, r, s, u, w, y, z


[Q]: ['j', '6675', 'u', 's', '705', '8227', 'f', 'w', 'n']
[A]: f, j, n, s, u, w


[Q]: ['7445', 's', '7961', 'z', '8359', '3409', '1405', 'n', 'm', '2535', '7251', '221', 'v', 'y', '9553', 'l', '999', 'l', '8091', '8243', 'q', 'g', '8903', '2031', 'h', '5139']
[A]:
g, h, l, m, n, q, s, v, y, z