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:
['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:
['9689', '9727', 't', 'd', '2103', 'c', 'n', '8553', '4559', '7815', 'u', 'l', 'c', 'e', 'u', 'n', '7207', '4875', '7699', 'h']

Ex Output:
c, d, e, h, l, n, t, u


Ex Input:
['4525', 'd', 'v', 'x', 'w', '503', '3847', 's', 'x', '5357', 'c', 'h', '6541', 'y', '3737', 'x', 'e', 'e', '2733', '1949', 'm', '8461', 'n', '6845', 'c', 'j', 'h', 'f']

Ex Output:

c, d, e, f, h, j, m, n, s, v, w, x, y