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: ['a', '2579', 'f', '6787', '123', '225', '6499', '4419', 'o', '1785', '7981', 'z', 'b', '2441', '2821', 'o', 'k', '2747', 's', 'u', 'q', '3901', '7629', 'k', 'm', 'q', '6577']
Example Output: a, b, f, k, m, o, q, s, u, z

Example Input: ['w', '9437', 's', '9819', 'q', 'q', '4443', 'p', '377', '6777', 's', 'x', 'a', 'o', '9205', '9289', '7103', 'k', 'l', '9453', '9043', 'k', 'r', 'g']
Example Output: a, g, k, l, o, p, q, r, s, w, x

Example Input: ['2473', 'i', 'd', '2649', 'l', '4749', 'x', 'd', '3341', '6221', '7155', 'i', '8173', '4719', '8607', 'f', 'g', '3813', '2861', 'g', 'h', '2811', '7421', 'r', 'a', '9581', 'n', 'b', '5337', 'h', '415', 'w', 'g', '263', 'g', 'l', 'm', '7587']
Example Output:
a, b, d, f, g, h, i, l, m, n, r, w, x