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: ['f', 't', '2135', '8397', '6361', '389', '2253', 'x', 'p', '4833', '5785', 'x', '1811', '9639', '5739', '175', '3231', '5931', 'r', 'c', 'g', 'h', 'p', '909', 'p', '587', 'a', 'a', 'h', 'q', 's', '5945', '4911', 't', 'h', '7517', 'p', '3177', 'h', 'u', '3577', '7055', 'l']
Example Output: a, c, f, g, h, l, p, q, r, s, t, u, x

Example Input: ['a', 'w', 'm', 'g', 'c', '5475', '7391', 't', '1049', 'p', 'd', '1397', 'k', 'x', 'j', '2525', 'f', '741']
Example Output: a, c, d, f, g, j, k, m, p, t, w, x

Example Input: ['6169', '33', '6353', '7851', '8043', '7611', 'l', '1085', 'q', '5267', 'w', '8079', '4435', 'i', '19', '5769', 'k', '4191', '5697', '8607', '3723', 'm', '4683', 'e', '5227', 'q', '7889', 'x', '1777', 'k']
Example Output:
e, i, k, l, m, q, w, x