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:
['7823', '2933', 'k', '4139', '5585', 'f', 'c', 'm', '2035', 'q', 'z', 'l', '1999', 'q', 'p', '7291', '2091', 'v', '423', 'e', 's', '6089', '4763', '6739']

Ex Output:
c, e, f, k, l, m, p, q, s, v, z


Ex Input:
['n', 'g', 'u', '2873', 'k', '4411', 'w', '8179', 'w', 'w', 'f', 'g', 'e', '7837', '3055', 'z', 's', '6037', 'n', '1479', 'c', '5311', 'i', 'w', 'z', '1891', '9663', 'y', 'f', 'h']

Ex Output:
c, e, f, g, h, i, k, n, s, u, w, y, z


Ex Input:
['9385', '1117', '1597', 'f', '8055', '9687', 'x', 'v', 'v', 'z', '1679', 'f', '4945', 'n', '8865', '9719', 'e', 'u', '5913', 'v', '2557', '4279', 'z', '9757', 'u', 'y', 'z', 'g', 'c', 's', '579', 'd', 'm', '2507', 'i', 'j', '3653', '5327', '3385', '3203', '2455', 'w', 'y', '5555']

Ex Output:

c, d, e, f, g, i, j, m, n, s, u, v, w, x, y, z