Detailed Instructions: 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.
Problem:['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']
Solution:
a, c, d, e, f, g, l, m, n, o, s, v