Definition: 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.
Input: ['9269', '8001', 'd', 'f', '5633', 'q', '4761', 'v', 'x', 'g', '7963', '111', 'i', 'h', '7543', 'f', '5317', 'l', '7697', 'b', '7349', '2661', '7841', 's', 's', '7005', '59', 'o', 'r', '8605', '9839', '5545', '8357']
Output:
b, d, f, g, h, i, l, o, q, r, s, v, x