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.

Input: Consider Input: ['r', 'n', '7583', '8697', '7927', 'l', '5003', '1363', 'p', 'e', 'q', '6227', '6915', '8619', '9011', 'n', '3063', '3799']

Output: e, l, n, p, q, r


Input: Consider 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']

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


Input: Consider Input: ['n', 's', 'a', 'b', '4129', '8641', 'k', '2047', '6109', '4535', 'z', 'k', '233', '3427', '3109', 'b', 'z', '2215', '6413', 'p', 't', 'v', 'e', 'a', '683', 'c', '4519', '8759', 'x', '3429', 'j', '859', '533', '4831', '3343', 'v', 'd', '9205', 'b', '7313', 't', 'm', '8811']


Output: a, b, c, d, e, j, k, m, n, p, s, t, v, x, z