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: ['t', 'a', '2481', '2841', 'a', '2871', 'm', '4435', 'g', '8201', '4351', '9045', 'o']
Example Output: a, g, m, o, t

Example Input: ['5859', 'x', 'z', 'v', 'l', 'z', 'g', 't', 'x', '341', '7023', '4937', 'b', 'n', 'y', 't', 's', '1369', '4461', 'f', '1315', 'l', '5221', '6583', 'h', 'j', 't']
Example Output: b, f, g, h, j, l, n, s, t, v, x, y, z

Example Input: ['n', '4559', 'o', '8409', 'h', 'm', '2035', 'h', 'e', 'n', '7711', 'b', 'f', '8253', '9409', 'g']
Example Output:
b, e, f, g, h, m, n, o