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: ['o', '4167', 'b', '1651', '8327', '9219', 'o', 'v', '5841', '6057', 'i', 'q', 'o', 'r', 'a', '7069', 'y', 'h', 'd', '3775', 'j', 't', '3663', '55', '7117', 'e', 'u', 'm', '931', '5777', '8773', '4891']
Example Output: a, b, d, e, h, i, j, m, o, q, r, t, u, v, y

Example Input: ['r', 'n', '7583', '8697', '7927', 'l', '5003', '1363', 'p', 'e', 'q', '6227', '6915', '8619', '9011', 'n', '3063', '3799']
Example Output: e, l, n, p, q, r

Example Input: ['5531', '4673', '1849', '6295', '9789', '8869', '3595', '1641', '8225', 'r', 'p', '9517', 'k', 'm']
Example Output:
k, m, p, r