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.
Q: ['5395', '2443', 'n', '2037', 'p', '5395', 't', '4075', 'k', 'l', 'k', 'j', 'm', '9317', 'r', 'z', '1427', 'a', 'g', 'p', 'c', 'v', 'p', 'v', 'z', 'x', '1171', '317', '9289', '5619', '3743']
A:
a, c, g, j, k, l, m, n, p, r, t, v, x, z