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:['2509', '9459', '639', '8327', 'j', 'a', '799', 'z', '3233', 'i', '5115', '7355', 'j', '5529', '9981', '5115', 'q', 't', '1073', 'n', 'x', 'q', 'l', 'i', 'z', '2043', '4001', 'm', 'h', 'q', '711', 'g']
Solution:
a, g, h, i, j, l, m, n, q, t, x, z