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]: ['g', '4165', 'n', 'w', 'n', 'e']
[EX A]: e, g, n, w

[EX Q]: ['q', '9033', 'p', 'z', '1743', '247', '967', '445', '9849', 'f', '9113', 'b', 'g', '6041', 'j', '927', 'i', 'p', '6821', 'q', '6701', 'f', 'j', 'o', 'y', 'c', '7981', 'b']
[EX A]: b, c, f, g, i, j, o, p, q, y, z

[EX Q]: ['2133', 'i', 'd', '1913', 'e', '5291', 't', '9631', 'p', 'g', '3221', '9069', 'k', 'f', 'p', 'v', '5361', '4481', '8755', '6173', 's', 't', 'v', 'c', 'n', 'm', 'c', 't', '3847', '4465', 't', '3367']
[EX A]:
c, d, e, f, g, i, k, m, n, p, s, t, v