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: ['v', '2989', 'z', '7843', 'e', '9923', 'y', 'b', '7611', 'u', 'u', '6227', '3145', 'w', '6451', 'g', '3129', 'o', 'r', 'z', '8349', 'u', 'h', 'd', 'g', 'a']
Example Output: a, b, d, e, g, h, o, r, u, v, w, y, z

Example Input: ['j', '917', 'w', 't', '8873', '1431', '8059', '7041']
Example Output: j, t, w

Example Input: ['c', 'l', '3479', '9871', 'c', '649', 'f', '3431', 'g', '6769', 'q', '6153', 'p', '59', 'd', 'p', 'k', 'd', '21', 'e', 'v', '5515']
Example Output:
c, d, e, f, g, k, l, p, q, v