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.

Ex Input:
['9555', '5983', '1853', 'c', 'z', 't', 'p', '9041', 'd', '5919', '1621', '345', 's', '2647', '4261', '8611', 'w', 'x', 'p', '9103', '2599', '5101', '9261', 'k', '7437']

Ex Output:
c, d, k, p, s, t, w, x, z


Ex Input:
['4423', '8295', 'h', '4881', 'j', 'c', '1185', 'z', 'm', '2725', 'p', '9187', '6275', '1617', '2523', '9879', '4149', '2197', '3909', '5155', '691', 'r', 'e', 'u', 'l', 'd', '1581', '2763', 'c']

Ex Output:
c, d, e, h, j, l, m, p, r, u, z


Ex Input:
['1989', '1861', 'b', 'w', '7749', '3231', 'd', '1651', 'y', '9643', 'd', 'm', 'r', '6453', '7505', 'l', '3243', '5819', 'z', 'f', 'j', 'x', 'j', '9795', '5239', '215', '6191', 'a', '4915', '8749', '8261', 'm', 'b', 'a', 'n', '1937', 'i', 'j', 'h', 'm', 'w', '4693']

Ex Output:

a, b, d, f, h, i, j, l, m, n, r, w, x, y, z