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', '4169', 'k', '7349', 'w', 't', '8271', '8781', '3725', '2865', '6053', 'j', 'z', '4211', '8231', '213', '6389', 'f', 'h', 'g', '9269', '4617', '4137', 'i', 'y', 'i', 'n', '4597', 'p', 'z', '3195', '3231', 'c', '1901', '1231', 'p', '4509', '2557', '3715']
Example Output: c, f, g, h, i, j, k, n, o, p, t, w, y, z

Example Input: ['4009', 'y', '9077', 'p', 'q', '6711', '6443', '5491']
Example Output: p, q, y

Example Input: ['z', 'o', 'x', '5403', '5737', 'f', 'p', 's', 'y', 'v', '6713', 'u', '7399', 'k', 'e', '5501', '5851', 'q', 'o', '269', 'q', 'l', '7617', 'e', '5945', '6307', 'k']
Example Output:
e, f, k, l, o, p, q, s, u, v, x, y, z