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: ['6495', '2259', '8213', 'm', 'y', '3377', 'q', 'i', '1299', 's', 'w', '4331', 'h', '5459', '4059', '6637', '8069', '5367', '6025', 'l', 'v', '4503', 'd', 'x', 'w', '5067', '9019', 'd', '7919', '7299', 'v', '8957', 'v', '5341', '2617', '8169', 'n', 'y']
Example Output: d, h, i, l, m, n, q, s, v, w, x, y

Example Input: ['8235', 't', '1695', '9899', '3633', 't', '1823', 'r', 'x']
Example Output: r, t, x

Example Input: ['8865', '227', 'w', '8133', '4225', '8183', '4797', '8791', 'd', '4217', 'a', 't', '1027', 'b', 'd', 'p', '8351', '4799', '3163', 'e', '9739', 'f', 'c', 'u', '4369', '4279', 'o', 'b', 'z', '497', '1393', 'o', '667']
Example Output:
a, b, c, d, e, f, o, p, t, u, w, z