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.

[EX Q]: ['h', 'v', '1263', 'y', '3299', 'd', 'a', 'h', 's', '2007', '7597', '1015', 'k', '6643', '6959', 'g', 'u', 'd', '5737', 'n', 'z', 'y', 'b', 'g', '9059', '7349', 'j', 'w', 'i', 'z', 'p', '5809', 'x', '4421', 'g', '6399', '3965']
[EX A]: a, b, d, g, h, i, j, k, n, p, s, u, v, w, x, y, z

[EX Q]: ['g', 'x', 'l', 'e', 'd', '1345', '1763', 'm', 'c', '2057', 's', 'a', '4127', 'y', 'h', '8581', 'o', '9203', '4761', 'd', 'u', 'n']
[EX A]: a, c, d, e, g, h, l, m, n, o, s, u, x, y

[EX Q]: ['s', '7333', 'n', 'f', '9571', 'e', 'o', '3887', '211', '5713', 'm', 'v', 'c', 'm', '503', '8545', 'a', '2901', 'c', '7099', '1987', 'l', 'm', 'd', '227', '3541', 'd', '9577', '7295', 'g', 'm', 'c', '2901']
[EX A]:
a, c, d, e, f, g, l, m, n, o, s, v