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.
Input: ['a', '7733', 'n', '3377', '1073', 'q', 'e', '7927', 'v', 'u', '2561', 'l', '3339', '2693', 'v', '1165', 'r', '2711', '5859', '2141', 'h', 'x', '2755', '4745', 'l', '7253', '1273', '1163', 'g']
Output:
a, e, g, h, l, n, q, r, u, v, x