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.

Example Input: ['l', '6313', '3199', 'w', '249', '8747', '7391', '3871', '173', 'x', 'o', '8647', '4413', '3645', '6123', '701', 'q', '2147', '4289', '7333', '533']
Example Output: l, o, q, w, x

Example Input: ['o', 'h', 'z', 'n', 'e', 'y', 't', '4371', 'm', '1059', '4853', '8529', 'l']
Example Output: e, h, l, m, n, o, t, y, z

Example Input: ['i', 'j', 'a', 'k', 'b', '2485', 'l', 't', '7845', 'j', '5087', 'x', '6329', '8383', 'u', '2591', '7245', '3123', 'n', 'o', 'y', '2739', '8903', '467', 'k', '9987', '115', '8221', '7919', 'k', '5925', 'v', '9381', '4489', 'z', 's', 'c', '6917', '5543', 'm', 'q', '6893', 'j']
Example Output:
a, b, c, i, j, k, l, m, n, o, q, s, t, u, v, x, y, z