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


[Q]: ['o', 'h', 'z', 'n', 'e', 'y', 't', '4371', 'm', '1059', '4853', '8529', 'l']
[A]: e, h, l, m, n, o, t, y, z


[Q]: ['7981', 'p', 'h', 'e', 'b', '6957', '241', '3851', 'y', '3687', 'n', 'l', 'q', 'o', 'z', '3533', '7399', '3029', 'k', '7407', 'w', 'd', '5237', '5759', '8213', '5425']
[A]:
b, d, e, h, k, l, n, o, p, q, w, y, z