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]: ['9925', 'f', '6149', 's', 'd', 's', '75', '8577', '2319', 'b', '3769', '5211', 'q', 'm', '8127', 'f', '3801']
[EX A]: b, d, f, m, q, s

[EX Q]: ['4925', 'i', 'q', 'k', '7615', 'r', '7217', 'o', '8097', '9151']
[EX A]: i, k, o, q, r

[EX Q]: ['t', 'v', '7541', '3765', 'j', '4347', 'i', 'g', '4253', '5813', '5547', 'v', '7453', '2669', 'z', '1657', '289', 'b', 'h', '9325', '4613', '2385', 'a']
[EX A]:
a, b, g, h, i, j, t, v, z